Jiangsu Education Edition Seventh Grade Biology Volume 2

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"Human Digestion and Absorption" PPT

Part One: Situation Import

1. What does the human digestive system consist of?

2. What organs does the digestive tract consist of? What are the characteristics of each?

3. What are the functions of each organ in the digestive tract?

4. What kinds of organs do the digestive glands mainly include? What is the role of each?

Digestion and absorption of the human body PPT, part 2: digestive system

1.Digestive tract

⑴Composition of digestive tract

⑵The functions of each part of the digestive tract

①Oral cavity: Chewing with teeth and stirring with tongue mixes food with saliva

②Pharynx and esophagus: passage of food

③Stomach: Temporarily stores food. The food turns into chyme in the stomach, and the stomach wall secretes gastric juice.

④Small intestine: There are intestinal glands inside, secreting intestinal juice

⑤Large Intestine: Undigested food residue forms feces

⑥Anus: feces is discharged from the body through the anus

2. Digestive glands

⑴Types and functions of digestive glands

⑵Function of digestive glands

① Salivary glands: secrete saliva and initially decompose starch

②Gastric glands: secrete gastric juice and initially digest proteins

③Liver: secretes bile, does not contain digestive enzymes

④Pancreas: secretes pancreatic juice, containing enzymes for digesting sugars, proteins, and fats

⑤Intestinal glands: secrete intestinal juice, containing enzymes that digest sugars, proteins, and fats

Digestion and absorption of the human body PPT, part 3: thinking and discussion

How does tooth decay occur?

1. Can you explain the process of tooth decay?

Bacteria in the mouth can turn sugar into acid, which slowly eats away at tooth enamel. When the enamel is corroded, it will gradually become soft and discolored. When the corrosion progresses from the enamel to the dentin, a cavity will gradually form and penetrate into the pulp cavity.

2. Give 1 to 2 examples to explain how to protect teeth.

Brush your teeth every day, rinse your mouth after meals, etc.

Prevent dental caries

1. Brush your teeth every morning and evening, especially after eating candies and sweets.

2. Eat fiber-rich foods regularly. During the chewing process, the teeth are often in a state of friction and scrubbing to ensure that it is not easy for acid to ferment in the mouth when eating.

3. When potential cavities are discovered, timely treatment is required to prevent the development of dental caries.

Digestion and absorption of the human body PPT, part 4: training to meet standards

1. The following living habits are likely to cause dental caries ( )

A. Rinse your mouth after meals and brush your teeth in the morning and evening. B. Like to eat snacks and sweets.

C. Like to drink milk and eat more meat D. Eat more vegetables and fruits

2. Which of the following statements about the stomach is incorrect ( )

A. The stomach is the most enlarged section of the digestive tract

B. The stomach can stir and grind food

C. There is a muscle layer in the stomach wall

D. The function of the stomach is to store food

3. Xiaowei suffers from dental caries and has been very painful recently, indicating that bacteria have invaded his ( )

A. Enamel B. Dentin

C. Cementum D. Pulp

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, human body digestion and absorption PPT download, .PPT format;

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Update Time: 2024-09-07

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