"Digestion of Food" Food in Life PPT Courseware 2

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"Digestion of Food" Food in Life PPT Courseware 2

Take a bite of food and carefully experience the process of swallowing it.

Based on the above experience and daily experience, how does food enter the human body? Where in the human body does the food we eat go?

discuss:

1. What happens to food after it enters the mouth?

2. Through what organ is food transported to the stomach, and what characteristics does it need to have?

3. Where is the food further ground and broken down, and what characteristics does it need to have?

4. Where is food absorbed and what characteristics does it need to have?

Kind tips

Don't gorge yourself when eating, chew carefully and slowly. If you gorge yourself when eating, your esophagus will inevitably be damaged and cause esophagitis. Don't eat hot food or eat too fast, as food is difficult to digest.

The stomach is in the upper part of the human abdominal cavity, like a big bag

Function: Preliminarily digest food through secretion of gastric juice and self-peristalsis

Simulation experiment: Fill a plastic bag with water, put steamed buns and cooked vegetables into the bag, and if you squeeze the bag repeatedly without damaging the bag, what will happen to the food inside? Which digestive organ acts like this bag?

Kind tips

1. Eat less fried food: Because this type of food is not easy to digest, eating more will cause indigestion.

2. Eat less pickled foods: These foods can cause cancer and should not be eaten in excess.

3. Eat less raw and cold foods and irritating foods: they have a strong stimulating effect and can easily cause diarrhea or digestive tract inflammation.

4. Regular and quantitative meals: Eat a moderate portion of each meal.

5. Chew slowly: to reduce the burden on the gastrointestinal tract. The more times food is chewed fully, the more saliva is secreted, which has a protective effect on the gastric mucosa.

The small intestine is the primary site of digestion and absorption:

Structural features of the small intestine that facilitate absorption:

1. The small intestine is very long (up to 5-6 meters)

2. The inner wall of the small intestine has annular folds and small intestinal villi, which greatly increases the absorption area.

3. The walls of the capillaries and lymphatic capillaries of the small intestinal villi have only a thin layer of epithelial cells (materials can easily pass through).

Class exercises

1. The initial digestion site of starch is __________.

2. Do all sugars taste sweet?

3. The initial digestion of protein occurs in __________.

4. The main place for absorbing nutrients is __________.

5. Digestive juice without digestive enzymes is ( )

A. Saliva B. Gastric juice

C. Bile D. Intestinal juice

think

1. Which parts of the digestive tract do you think are responsible for absorption?

What is the main site of absorption? Why?

Absorption in the digestive tract: stomach, small intestine, large intestine.

2. What nutrients can each part absorb?

3. Where do you think these nutrients go?

The circulatory system is carried throughout the body by blood.

4. Can you explain the concept of “absorption”?

Absorption is the process by which nutrients pass through the mucous membrane of the digestive tract wall and enter the circulatory system.

Consolidation exercises

1. In the digestive tract, the only function of digestion is _______, the one with only absorption is _______, the one with both digestion and absorption is __________, the one with neither digestion nor absorption is _______________.

2. The digestive system consists of __________ and _________.

3. The villous protruding structure formed by the mucosal layer of the small intestinal wall toward the intestinal lumen is _____________, and the structure formed by the depression is___________.

4. The final products of starch, protein, and fat digestion are ______, ______, and ___________ respectively, and the starting parts of their digestion are ______________.

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For more information about the PPT courseware "Food Digestion in Life", please click the "Food in Life ppt Food Digestion ppt" tab.

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Update Time: 2024-11-22

This template belongs to science courseware E-education edition third grade science volume 1 industry PPT template

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