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Answer of 11.3-11.4 NB, WB & WS

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Answer of 11.3-11.4 NB, WB & WS Answer of 11.3-11.4 NB, WB & WS

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Human Digestive System for Testing The Video System Human Digestive System for Testing The Video System

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Structure Of The Stomach - Functions Of The Stomach - How Does The Stomach Work Structure Of The Stomach - Functions Of The Stomach - How Does The Stomach Work

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S3 IS Exp Amylase S3 IS Exp Amylase

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S1 IS 植物分類 S1 IS 植物分類

S1 IS 植物分類

S1 IS 脊椎動物分類 S1 IS 脊椎動物分類

S1 IS 脊椎動物分類

S1 IS 動物分類 S1 IS 動物分類

S1 IS 動物分類

S1 IS 檢索表 S1 IS 檢索表

S1 IS 檢索表

Note P.4-5 Note P.4-5

Note P.4-5

How to use schoology How to use schoology

How to use schoology

LeeYu F1 IS 3.3生物與生境 LeeYu F1 IS 3.3生物與生境

LeeYu F1 IS 3.3生物與生境

3.4 生物多樣性 3.4 生物多樣性

3.4 生物多樣性

3.6保育 3.6保育

3.6保育

3.5生物多樣性減少 3.5生物多樣性減少

3.5生物多樣性減少

LEE YU S1 Ch6.1C LEE YU S1 Ch6.1C

LEE YU S1 Ch6.1C

LEE YU S1 Ch6.1AB LEE YU S1 Ch6.1AB

LEE YU S1 Ch6.1AB

LEEYU F1 6.2A LEEYU F1 6.2A

LEEYU F1 6.2A

LEE YU F1 Ch6.2B LEE YU F1 Ch6.2B

LEE YU F1 Ch6.2B

LEE YU F1 Ch6.4B LEE YU F1 Ch6.4B

LEE YU F1 Ch6.4B

LEE YU F1 Ch6.4A LEE YU F1 Ch6.4A

LEE YU F1 Ch6.4A

Human Digestive System for Testing The Video System

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Structure Of The Stomach - Functions Of The Stomach - How Does The Stomach Work

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In this video we discuss the structure of the stomach and the functions of the stomach. We cover the sections of the stomach and the different cells that make up the gastric pits in the stomach. Transcript/notes Stomach Your stomach is an organ that has many important roles in bodily functions. The stomach is like a holding sack as between 3 to 4 liters of food and drink enters it daily. These items typically spend 2 to 6 hours there before being passed on to the small intestine. The stomach is a J shaped organ located in the abdomen. When you chew food, then swallow it, it enters your esophagus, which connects with and passes the food to your stomach. The stomach is typically divided into 4 sections. The Cardia is the entryway to the stomach, near where the stomach and esophagus meet. The Fundus is the dome shaped region located above and to the left of where the stomach and esophagus meet. The body is the largest region of the stomach and it extends to the 4th section of the stomach, the pylorus. The pylorus is a funnel shaped region that connects the stomach to the duodenum of the small intestine. The inner lining of the stomach has a rough appearance made by gastric folds. These gastric folds have gastric pits which contain gastric glands. These glands secrete most of the gastric juice released in the stomach and this juice is a mucous fluid that contains mainly digestive enzymes and hydrochloric acid. There are 5 types of secretory cells that are located in the gastric epithelium. Surface mucous cells line the inner stomach and extend into the gastric pits and they secrete an alkaline fluid containing mucin that helps protect the stomach lining from exposure to the high acidity of gastric juices and gastric enzymes. Mucous neck cells are located deeper than the surface cells and they secrete an acidic mucin and which helps to maintain acidic conditions. Parietal cells produce hydrochloric acid and intrinsic factor. Intrinsic factor binds to vitamin B12 molecules and protects them from digestive juices until they reach the small intestine. Hydrochloric acid is not actually produced in the cells, as it forms form positive hydrogen ions and negative chlorine ions secreted from the cells. Hydrochloric acid is responsible for the low pH level in the stomach. Hcl is important in enzyme activation, unfolding certain proteins and it also protects against many microorganisms. Chief cells produce pepsinogen, which is the precursor to the enzyme pepsin. Pepsin is activated by hydrochloric acid in the stomach, and it digests or breaks down proteins into smaller peptide fragments. Chief cells also produce gastric lipase which is an enzyme that aids in the digestion of fats. G cells release gastrin into blood, which stimulates the production of hydrochloric acid and pepsinogen, ensuring that there are enough digestive enzymes when food is present in the stomach. The outer stomach wall is comprised of 3 layers of smooth muscle tissue, an oblique muscle layer, a circular muscle layer, and a longitudinal layer, with a serosa being the outermost layer. The stomach has several important functions in your body, as it serves as a food reservoir, storing food until it can be moved into the small intestine. As we have covered, it releases gastric juice, which contains enzymes that take part in the digestion of food. The stomach actually churns food, breaking it down into smaller particles and mixing them with the gastric juice. It secretes intrinsic factor, which protects vitamin B12 molecules, which are important in cell metabolism. The stomach absorbs some alcohol, aspirin, and some short chain fatty acids. And the stomach produces gastrin to help regulate digestive functions.

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S3 IS Exp Amylase

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S1 IS 植物分類

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S1 IS 植物分類

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S1 IS 脊椎動物分類

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S1 IS 脊椎動物分類

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S1 IS 動物分類

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S1 IS 檢索表

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Note P.4-5

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Note P.4-5

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How to use schoology

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LeeYu F1 IS 3.3生物與生境

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3.4 生物多樣性

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3.6保育

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3.6保育

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3.5生物多樣性減少

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LEE YU S1 Ch6.1C

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LEE YU S1 Ch6.1AB

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LEEYU F1 6.2A

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LEE YU F1 Ch6.2B

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這裡是宇宙裡最美麗的星球,地球。湛藍美麗的大海,你們看是不是很美?但仔細看看海裡面是什麼?通通都是塑膠垃圾!垃圾在海面上飄,它的面積有535個臺灣大,而且還一直在增加中,很多海洋生物好朋友們都因此受害了!我是小鯨魚小梧子,減少塑膠用品我和我的海洋好朋友謝謝你!

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Animation created in Flash and After Effects looking at mans relationship with the natural world. Music: In the Hall of the Mountain King by Edvard Grieg. "Hall of the Mountain King" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/ https://www.facebook.com/SteveCuttsArt https://twitter.com/Steve_Cutts http://www.stevecutts.com Copyright © 2012 www.stevecutts.com

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F1 IS 2.3 C Methods of purification F1 IS 2.3 C Methods of purification

F1 IS 2.3 C Methods of purification

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1A IS Unit 2 Section 2.3 Part C 3 1A IS Unit 2 Section 2.3 Part C 3

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1A IS Unit 2 Section 2.3 Part C 2 1A IS Unit 2 Section 2.3 Part C 2

1A IS Unit 2 Section 2.3 Part C 2

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F2 IS 10.4 味覺和嗅覺 F2 IS 10.4 味覺和嗅覺

F2 IS 10.4 味覺和嗅覺

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F1 IS 2.3_A & B F1 IS 2.3_A & B

F1 IS 2.3_A & B

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1A IS Unit 2 Section 2.3 Part C 1 1A IS Unit 2 Section 2.3 Part C 1

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1A IS Unit 2 Section 2.3 Part A-B 1A IS Unit 2 Section 2.3 Part A-B

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F1 IS 2.2 Tutorials F1 IS 2.2 Tutorials

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IS_S1_Expt_2.13 IS_S1_Expt_2.13

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IS_S1_Expt_2.12 IS_S1_Expt_2.12

IS_S1_Expt_2.12

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IS_S1_Expt_2.11 IS_S1_Expt_2.11

IS_S1_Expt_2.11

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IS_S1_Expt_2.10 IS_S1_Expt_2.10

IS_S1_Expt_2.10

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IS_S1_Expt_2.9 IS_S1_Expt_2.9

IS_S1_Expt_2.9

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IS_S1_Expt_2.8 IS_S1_Expt_2.8

IS_S1_Expt_2.8

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IS_S1_Expt_2.7 IS_S1_Expt_2.7

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F2 IS 10.6 平衡的感覺

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F2 IS 10.5 觸覺

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F1 IS 2.3 C Methods of purification

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Filtration Part 2

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F1 IS 2.3 C Methods of purification

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Filtration Part 1

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F1 IS 2.3 C Methods of purification

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Sedimentation

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1A IS Unit 2 Section 2.3 Part C 3

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1A IS Unit 2 Section 2.3 Part C 2

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F2 IS 10.4 味覺和嗅覺

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F2 IS 10.4 味覺和嗅覺

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F1 IS 2.3_A & B

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F1 IS 2.3_A & B

A. Importance of water B. Impurities of water

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1A IS Unit 2 Section 2.3 Part C 1

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1A IS Unit 2 Section 2.3 Part C 1

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1A IS Unit 2 Section 2.3 Part A-B

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1A IS Unit 2 Section 2.2 Part C

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F1 IS 2.2 Tutorials

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IS_S1_Expt_2.13

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IS_S1_Expt_2.12

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IS_S1_Expt_2.11

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IS_S1_Expt_2.10

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IS_S1_Expt_2.10

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IS_S1_Expt_2.9

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IS_S1_Expt_2.8

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IS_S1_Expt_2.7

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IS_S1_Expt_2.6 IS_S1_Expt_2.6

IS_S1_Expt_2.6

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IS_S1_Expt_2.5 IS_S1_Expt_2.5

IS_S1_Expt_2.5

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IS_S1_Expt_2.4 IS_S1_Expt_2.4

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IS_S1_Expt_1.10 IS_S1_Expt_1.10

IS_S1_Expt_1.10

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IS_S1_Expt_1.9 IS_S1_Expt_1.9

IS_S1_Expt_1.9

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IS_S1_Expt_1.11 IS_S1_Expt_1.11

IS_S1_Expt_1.11

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11.3-11.4 Quiz Correction 11.3-11.4 Quiz Correction

11.3-11.4 Quiz Correction

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Answer of 11.3-11.4 NB, WB & WS Answer of 11.3-11.4 NB, WB & WS

Answer of 11.3-11.4 NB, WB & WS

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Making use of friction & air resistance Making use of friction & air resistance

Making use of friction & air resistance

Reducing friction & Air resistance II Reducing friction & Air resistance II

Reducing friction & Air resistance II

Reducing friction & Air resistance I Reducing friction & Air resistance I

Reducing friction & Air resistance I

Air resistance Air resistance

Air resistance

Friction Friction

Friction

1A IS Unit 1 1.3 Part E 1A IS Unit 1 1.3 Part E

1A IS Unit 1 1.3 Part E

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1.3 B 1.3 B

1.3 B

1.3 C-D 1.3 C-D

1.3 C-D

1A IS Unit 1 1.3 Part C & D 1A IS Unit 1 1.3 Part C & D

1A IS Unit 1 1.3 Part C & D

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Mass & weight Mass & weight

Mass & weight

Mass & weight Mass & weight

Mass & weight

IS_S1_Expt_2.6

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IS_S1_Expt_2.5

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IS_S1_Expt_2.4

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IS_S1_Expt_1.10

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IS_S1_Expt_1.9

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IS_S1_Expt_1.11

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11.3-11.4 Quiz Correction

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11.3-11.4 Quiz Correction

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Answer of 11.3-11.4 NB, WB & WS

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Answer of 11.3-11.4 NB, WB & WS

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Making use of friction & air resistance

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Reducing friction & Air resistance II

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Reducing friction & Air resistance II

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Reducing friction & Air resistance I

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Reducing friction & Air resistance I

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Air resistance

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Air resistance

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Friction

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Friction

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1A IS Unit 1 1.3 Part E

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1A IS Unit 1 1.3 Part E

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1.3 B

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1.3 C-D

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1A IS Unit 1 1.3 Part C & D

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1A IS Unit 1 1.3 Part B

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Mass & weight

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Mass & weight

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1.3 Laboratory safety 1.3 Laboratory safety

1.3 Laboratory safety

Sample questions of chemical cell Sample questions of chemical cell

Sample questions of chemical cell

1A IS Unit 1 1.3 Part A 1A IS Unit 1 1.3 Part A

1A IS Unit 1 1.3 Part A

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Force of gravity Force of gravity

Force of gravity

Force of gravity Force of gravity

Force of gravity

Classifying, pattern seeking & model building Classifying, pattern seeking & model building

Classifying, pattern seeking & model building

Fair test Fair test

Fair test

1A IS Unit 1 1.2 Part B1 1A IS Unit 1 1.2 Part B1

1A IS Unit 1 1.2 Part B1

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1A IS Unit 1 1.2 Part A 1A IS Unit 1 1.2 Part A

1A IS Unit 1 1.2 Part A

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Steps of scientific investigation Steps of scientific investigation

Steps of scientific investigation

Balanced force & unbalanced force II Balanced force & unbalanced force II

Balanced force & unbalanced force II

Balanced force & unbalanced force Balanced force & unbalanced force

Balanced force & unbalanced force

1.1 D 1.1 D

1.1 D

WB WB

WB

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WB WB

WB

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1.1 C2-4 1.1 C2-4

1.1 C2-4

9/9 Contact force & non-contact force(POW:F2is) 9/9 Contact force & non-contact force(POW:F2is)

9/9 Contact force & non-contact force(POW:F2is)

Balanced & unbalanced force (10/9) Balanced & unbalanced force (10/9)

Balanced & unbalanced force (10/9)

1A IS Unit 1 1.1 Part D 1A IS Unit 1 1.1 Part D

1A IS Unit 1 1.1 Part D

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1A IS Unit 1 1.1 Part C (2-4) 1A IS Unit 1 1.1 Part C (2-4)

1A IS Unit 1 1.1 Part C (2-4)

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1.3 Laboratory safety

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Laboratory safety

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Sample questions of chemical cell

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Laboratory safety

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1A IS Unit 1 1.3 Part A

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1A IS Unit 1 1.3 Part A

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Force of gravity

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Force of gravity

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Classifying, pattern seeking & model building

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Fair test

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Fair test

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1A IS Unit 1 1.2 Part B1

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1A IS Unit 1 1.2 Part B1

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1A IS Unit 1 1.2 Part A

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1A IS Unit 1 1.2 Part A

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Steps of scientific investigation

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Balanced force & unbalanced force II

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Balanced force & unbalanced force

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1.1 D

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1.1 D

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WB

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WB

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WB

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WB

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1.1 C2-4

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9/9 Contact force & non-contact force(POW:F2is)

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9/9 Contact force & non-contact force(POW:F2is)

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Balanced & unbalanced force (10/9)

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1A IS Unit 1 1.1 Part D

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1A IS Unit 1 1.1 Part D

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1A IS Unit 1 1.1 Part C (2-4)

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1A IS Unit 1 1.1 Part C (2-4)

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1A IS Unit 1 1.1 Part C (1) 1A IS Unit 1 1.1 Part C (1)

1A IS Unit 1 1.1 Part C (1)

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1A IS Unit 1 1.1 Part A & B 1A IS Unit 1 1.1 Part A & B

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F2 IS Section 11.2 - force 1 F2 IS Section 11.2 - force 1

F2 IS Section 11.2 - force 1

F2 IS Section 11.2 - Force 2 F2 IS Section 11.2 - Force 2

F2 IS Section 11.2 - Force 2

F1 IS Section 1.1 C1 F1 IS Section 1.1 C1

F1 IS Section 1.1 C1

F1 IS Section 1.1 A-B F1 IS Section 1.1 A-B

F1 IS Section 1.1 A-B

20200528 F2 IS Video Class 40 (Part A) 20200528 F2 IS Video Class 40 (Part A)

20200528 F2 IS Video Class 40 (Part A)

20200528 F2 IS Video Class 40 (Part C) 20200528 F2 IS Video Class 40 (Part C)

20200528 F2 IS Video Class 40 (Part C)

Sec4-5BC Sec4-5BC

Sec4-5BC

Sec4-5D Sec4-5D

Sec4-5D

20200526 F2 IS Video Class 39(Part A) 20200526 F2 IS Video Class 39(Part A)

20200526 F2 IS Video Class 39(Part A)

20200526 F2 IS Video Class 39(Part B) 20200526 F2 IS Video Class 39(Part B)

20200526 F2 IS Video Class 39(Part B)

Sec4-5A Sec4-5A

Sec4-5A

Sec4-4 Sec4-4

Sec4-4

20200525 F2 IS Video Class 38 (Part B) 20200525 F2 IS Video Class 38 (Part B)

20200525 F2 IS Video Class 38 (Part B)

20200525 F2 IS Video Class 38 (Part A) 20200525 F2 IS Video Class 38 (Part A)

20200525 F2 IS Video Class 38 (Part A)

20200522 F2 IS Online Class 37 20200522 F2 IS Online Class 37

20200522 F2 IS Online Class 37

20200521 F2 IS Video class 36 (Part A) 20200521 F2 IS Video class 36 (Part A)

20200521 F2 IS Video class 36 (Part A)

20200521 F2 IS Video class 36 (Part B) 20200521 F2 IS Video class 36 (Part B)

20200521 F2 IS Video class 36 (Part B)

Sec4-3C Sec4-3C

Sec4-3C

1A IS Unit 1 1.1 Part C (1)

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1A IS Unit 1 1.1 Part C (1)

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1A IS Unit 1 1.1 Part A & B

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1A IS Unit 1 1.1 Part A & B

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F2 IS Section 11.2 - force 1

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Basic idea of force

Effects of force

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F2 IS Section 11.2 - Force 2

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F2 IS Section 11.2 - Force 2

How to measure force?

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F1 IS Section 1.1 C1

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F1 IS Section 1.1 C1

Scientific discoveries & invention

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F1 IS Section 1.1 A-B

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F1 IS Section 1.1 A-B

What is science?

Branches of science

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20200528 F2 IS Video Class 40 (Part A)

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20200528 F2 IS Video Class 40 (Part A)

9.3 Application of neutralisation

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20200528 F2 IS Video Class 40 (Part C)

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20200528 F2 IS Video Class 40 (Part C)

9.3 Application of neutralisation

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Sec4-5BC

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Sec4-5D

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20200526 F2 IS Video Class 39(Part A)

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20200526 F2 IS Video Class 39(Part A)

9.3 Neutralization

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20200526 F2 IS Video Class 39(Part B)

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20200526 F2 IS Video Class 39(Part B)

9.3 Neutralization

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Sec4-5A

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Sec4-4

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Sec4-4

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20200525 F2 IS Video Class 38 (Part B)

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20200525 F2 IS Video Class 38 (Part B)

9.2 pH meter & pH sensor

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20200525 F2 IS Video Class 38 (Part A)

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20200525 F2 IS Video Class 38 (Part A)

9.2 pH meter & pH sensor

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20200522 F2 IS Online Class 37

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20200522 F2 IS Online Class 37

9.2 Universal indicator and pH scale

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20200521 F2 IS Video class 36 (Part A)

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20200521 F2 IS Video class 36 (Part A)

9.2 Natural indicator

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20200521 F2 IS Video class 36 (Part B)

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20200521 F2 IS Video class 36 (Part B)

9.2 Natural indicator

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Sec4-3C

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Sec4-3D Sec4-3D

Sec4-3D

Sec4-3A Sec4-3A

Sec4-3A

Sec4-3B Sec4-3B

Sec4-3B

20200519 F2 IS Video Class 35 20200519 F2 IS Video Class 35

20200519 F2 IS Video Class 35

20200518 F2 IS Video Class 34 20200518 F2 IS Video Class 34

20200518 F2 IS Video Class 34

20200514 F2 IS Video class 33 20200514 F2 IS Video class 33

20200514 F2 IS Video class 33

20200513 F2 IS Video class 31 (Part B) 20200513 F2 IS Video class 31 (Part B)

20200513 F2 IS Video class 31 (Part B)

20200513 F2 IS Video class 31 (Part A) 20200513 F2 IS Video class 31 (Part A)

20200513 F2 IS Video class 31 (Part A)

202005012 F2 IS Video class 30 (Part B) 202005012 F2 IS Video class 30 (Part B)

202005012 F2 IS Video class 30 (Part B)

202005012 F2 IS Video class 30 (Part A) 202005012 F2 IS Video class 30 (Part A)

202005012 F2 IS Video class 30 (Part A)

Sec4-1D Sec4-1D

Sec4-1D

Sec4-1E Sec4-1E

Sec4-1E

20200508 F2 IS Video class 29 20200508 F2 IS Video class 29

20200508 F2 IS Video class 29

20200507 F2 IS Video Class 28 20200507 F2 IS Video Class 28

20200507 F2 IS Video Class 28

20200506 F2 IS Video class 27 20200506 F2 IS Video class 27

20200506 F2 IS Video class 27

Sec4-1C Sec4-1C

Sec4-1C

Sec4-1AB Sec4-1AB

Sec4-1AB

20200505 F2 IS Video Class 26 20200505 F2 IS Video Class 26

20200505 F2 IS Video Class 26

20200427 F2 IS Ch.10 對作業 20200427 F2 IS Ch.10 對作業

20200427 F2 IS Ch.10 對作業

Sec5-3C Sec5-3C

Sec5-3C

Sec4-3D

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Sec4-3A

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Sec4-3B

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20200519 F2 IS Video Class 35

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20200519 F2 IS Video Class 35

9.1 Alkali

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20200518 F2 IS Video Class 34

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20200518 F2 IS Video Class 34

9.1 Acid

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20200514 F2 IS Video class 33

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20200514 F2 IS Video class 33

12.5非傳染病

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20200513 F2 IS Video class 31 (Part B)

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20200513 F2 IS Video class 31 (Part B)

12.5 預防傳染病

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20200513 F2 IS Video class 31 (Part A)

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20200513 F2 IS Video class 31 (Part A)

12.5 預防傳染病

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202005012 F2 IS Video class 30 (Part B)

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202005012 F2 IS Video class 30 (Part B)

12.5 傳染病

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202005012 F2 IS Video class 30 (Part A)

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202005012 F2 IS Video class 30 (Part A)

12.5 傳染病

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Sec4-1D

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Sec4-1D

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Sec4-1E

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Sec4-1E

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20200508 F2 IS Video class 29

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20200508 F2 IS Video class 29

12.1 基本食物物質的構件 及 水的重要性

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20200507 F2 IS Video Class 28

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20200507 F2 IS Video Class 28

Ch.12 保護性食物物質

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20200506 F2 IS Video class 27

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20200506 F2 IS Video class 27

Ch.13.1 基本食物物質

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Sec4-1C

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Sec4-1C

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Sec4-1AB

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Sec4-1AB

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20200505 F2 IS Video Class 26

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20200505 F2 IS Video Class 26

Ch.12 保持身體健康

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20200427 F2 IS Ch.10 對作業

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20200427 F2 IS Ch.10 對作業

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Sec5-3C

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20200422 F2 IS - Ch.10 - HW (Part A) 20200422 F2 IS - Ch.10 - HW (Part A)

20200422 F2 IS - Ch.10 - HW (Part A)

Sec5-3A Sec5-3A

Sec5-3A

Sec5-3B Sec5-3B

Sec5-3B

20200403 F2 IS Video class 25 20200403 F2 IS Video class 25

20200403 F2 IS Video class 25

20200402 F2 IS Video class 24 (Part B) 20200402 F2 IS Video class 24 (Part B)

20200402 F2 IS Video class 24 (Part B)

20200402 F2 IS Video class 24 (Part A) 20200402 F2 IS Video class 24 (Part A)

20200402 F2 IS Video class 24 (Part A)

Sec5-2A Sec5-2A

Sec5-2A

Sec5-2BC Sec5-2BC

Sec5-2BC

Sec5-1 Sec5-1

Sec5-1

20200325 F2 IS Video class 22 20200325 F2 IS Video class 22

20200325 F2 IS Video class 22

20200324 F2 IS Video class 21 20200324 F2 IS Video class 21

20200324 F2 IS Video class 21

20200323 F2 IS Video class 20 (Part A) 20200323 F2 IS Video class 20 (Part A)

20200323 F2 IS Video class 20 (Part A)

20200323 F2 IS Video class 20 (Part B) 20200323 F2 IS Video class 20 (Part B)

20200323 F2 IS Video class 20 (Part B)

6-6C 6-6C

6-6C

6-6D 6-6D

6-6D

6-6AB 6-6AB

6-6AB

20200316 F4 Chem Online class 15 ( Part B) 20200316 F4 Chem Online class 15 ( Part B)

20200316 F4 Chem Online class 15 ( Part B)

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LEE YU F1 Ch6.4A LEE YU F1 Ch6.4A

LEE YU F1 Ch6.4A

LEE YU F1 Ch6.4B LEE YU F1 Ch6.4B

LEE YU F1 Ch6.4B

LEE YU F1 Ch6.2B LEE YU F1 Ch6.2B

LEE YU F1 Ch6.2B

20200422 F2 IS - Ch.10 - HW (Part A)

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20200422 F2 IS - Ch.10 - HW (Part A)

Ch.10 Force & Motion 一齊做功课

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Sec5-3A

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Sec5-3B

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20200403 F2 IS Video class 25

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20200403 F2 IS Video class 25

10.7 腦與我我們的感覺 (E)

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20200402 F2 IS Video class 24 (Part B)

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20200402 F2 IS Video class 24 (Part B)

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20200402 F2 IS Video class 24 (Part A)

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20200402 F2 IS Video class 24 (Part A)

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Sec5-2A

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Sec5-2BC

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Sec5-1

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20200325 F2 IS Video class 22

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20200325 F2 IS Video class 22

10.3 耳朵的限制及保護

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20200324 F2 IS Video class 21

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20200324 F2 IS Video class 21

10.3 為何聽到聲音

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20200323 F2 IS Video class 20 (Part A)

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20200323 F2 IS Video class 20 (Part A)

10.3 聲音

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20200323 F2 IS Video class 20 (Part B)

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20200323 F2 IS Video class 20 (Part B)

10.3 聲音

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6-6C

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6-6C

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6-6D

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6-6AB

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6-6AB

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20200316 F4 Chem Online class 15 ( Part B)

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20200316 F4 Chem Online class 15 ( Part B)

Ch.19 Preparation of a standard solution by dilution

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LEE YU F1 Ch6.4A

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LEE YU F1 Ch6.4B

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LEE YU F1 Ch6.2B

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LEEYU F1 6.2A LEEYU F1 6.2A

LEEYU F1 6.2A

LEE YU S1 Ch6.1AB LEE YU S1 Ch6.1AB

LEE YU S1 Ch6.1AB

LEE YU S1 Ch6.1C LEE YU S1 Ch6.1C

LEE YU S1 Ch6.1C

3.5生物多樣性減少 3.5生物多樣性減少

3.5生物多樣性減少

3.6保育 3.6保育

3.6保育

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Structure Of The Stomach - Functions Of The Stomach - How Does The Stomach Work Structure Of The Stomach - Functions Of The Stomach - How Does The Stomach Work

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Note P.4-5

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Structure Of The Stomach - Functions Of The Stomach - How Does The Stomach Work

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Structure Of The Stomach - Functions Of The Stomach - How Does The Stomach Work

In this video we discuss the structure of the stomach and the functions of the stomach. We cover the sections of the stomach and the different cells that make up the gastric pits in the stomach. Transcript/notes Stomach Your stomach is an organ that has many important roles in bodily functions. The stomach is like a holding sack as between 3 to 4 liters of food and drink enters it daily. These items typically spend 2 to 6 hours there before being passed on to the small intestine. The stomach is a J shaped organ located in the abdomen. When you chew food, then swallow it, it enters your esophagus, which connects with and passes the food to your stomach. The stomach is typically divided into 4 sections. The Cardia is the entryway to the stomach, near where the stomach and esophagus meet. The Fundus is the dome shaped region located above and to the left of where the stomach and esophagus meet. The body is the largest region of the stomach and it extends to the 4th section of the stomach, the pylorus. The pylorus is a funnel shaped region that connects the stomach to the duodenum of the small intestine. The inner lining of the stomach has a rough appearance made by gastric folds. These gastric folds have gastric pits which contain gastric glands. These glands secrete most of the gastric juice released in the stomach and this juice is a mucous fluid that contains mainly digestive enzymes and hydrochloric acid. There are 5 types of secretory cells that are located in the gastric epithelium. Surface mucous cells line the inner stomach and extend into the gastric pits and they secrete an alkaline fluid containing mucin that helps protect the stomach lining from exposure to the high acidity of gastric juices and gastric enzymes. Mucous neck cells are located deeper than the surface cells and they secrete an acidic mucin and which helps to maintain acidic conditions. Parietal cells produce hydrochloric acid and intrinsic factor. Intrinsic factor binds to vitamin B12 molecules and protects them from digestive juices until they reach the small intestine. Hydrochloric acid is not actually produced in the cells, as it forms form positive hydrogen ions and negative chlorine ions secreted from the cells. Hydrochloric acid is responsible for the low pH level in the stomach. Hcl is important in enzyme activation, unfolding certain proteins and it also protects against many microorganisms. Chief cells produce pepsinogen, which is the precursor to the enzyme pepsin. Pepsin is activated by hydrochloric acid in the stomach, and it digests or breaks down proteins into smaller peptide fragments. Chief cells also produce gastric lipase which is an enzyme that aids in the digestion of fats. G cells release gastrin into blood, which stimulates the production of hydrochloric acid and pepsinogen, ensuring that there are enough digestive enzymes when food is present in the stomach. The outer stomach wall is comprised of 3 layers of smooth muscle tissue, an oblique muscle layer, a circular muscle layer, and a longitudinal layer, with a serosa being the outermost layer. The stomach has several important functions in your body, as it serves as a food reservoir, storing food until it can be moved into the small intestine. As we have covered, it releases gastric juice, which contains enzymes that take part in the digestion of food. The stomach actually churns food, breaking it down into smaller particles and mixing them with the gastric juice. It secretes intrinsic factor, which protects vitamin B12 molecules, which are important in cell metabolism. The stomach absorbs some alcohol, aspirin, and some short chain fatty acids. And the stomach produces gastrin to help regulate digestive functions.

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