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Authoritative PPT Summary
"Digestion and Absorption of Food" PPT courseware
Part One: Digestive System
Digestive system components
The human digestive system consists of a digestive tract and digestive glands that secrete digestive juices.
Digestion and absorption of food PPT, Part 2: Digestion and absorption of food
1. The concept of digestion
The process by which food is broken down into absorbable components in the digestive tract is called digestion.
physical digestion
The process by which food is shredded, ground, and softened.
chemical digestion
Food is broken down into small molecules that can be absorbed by the body under the action of digestive enzymes.
2. Food and place for digestion
①The digestion of starch begins in the mouth
What is the function of the thick muscular layer of the stomach wall? In the stomach wall, what are the digestive glands and digestive juices secreted that are related to food digestion? What are the main nutrients digested?
The contraction of the thick muscle layer of the stomach wall causes gastric peristalsis, which is beneficial to the physical digestion of food.
The digestive glands in the stomach wall related to food digestion are gastric glands, which secrete gastric juice and mainly digest proteins in nutrients.
②Protein digestion starts from the stomach
The main functions of the stomach:
It temporarily stores food, allows food and gastric juice to be fully mixed, and carries out preliminary digestion. It also has the function of absorption.
In addition to the intestinal glands on the intestinal wall that secrete digestive juice into the small intestine, what other digestive glands secrete digestive juice into the small intestine? What nutrients are these digestive juices related to the digestion of?
Pancreatic juice secreted by the pancreas and bile secreted by the liver flow into the small intestine. Digestible starch, protein and fat.
Food digestion and absorption PPT, part 3: enzymes
1. Definition
Enzymes are proteins produced by organisms that have catalytic capabilities
It can turn sugars, fats, and proteins in food into absorbable substances, which can be called biocatalysts.
Think: What are the characteristics of enzymes? Do all enzymes work under all conditions?
2. Characteristics of enzymes
⑴Diversity
⑵Specificity
⑶High efficiency
3. Main factors affecting enzyme activity
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"Digestion and Absorption of Food" PPT (Lesson 3):
"Digestion and Absorption of Food" PPT (Third Lesson) Part One Content: Learning Objectives 1. Describe the chemical nature and functions of enzymes; 2. Outline the characteristics of high efficiency and specificity of enzyme catalysis; 3. Distinguish between various An experiment to verify the properties of an enzyme. ... ... .....
"Digestion and Absorption of Food" PPT (second lesson):
"Digestion and Absorption of Food" PPT (Second Lesson) Part One: Reviewing the Past and Learning the New 1. What does the digestive system consist of? 2. What are the composition and types of teeth? 3. What are the causes of dental caries? What's the harm? Learning Objectives 1. Name protein,...
"Digestion and Absorption of Food" PPT (first lesson):
"Digestion and Absorption of Food" PPT (first lesson) Part One: Situation Introduction 1. Why are people with chronic gastrointestinal diseases thinner? 2. Why do some people eat a lot but never gain weight? Nutrients in food: water, inorganic salts, vitamins...