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"Food and Nutrition" PPT (first lesson)
Part One: Scenario Introduction
Why do people grow up? Where does the energy for various life activities come from?
Energy for various activities performed by humans and animals comes from food.
learning target
1. Tell me how to measure the energy content of food;
2. Name the seven major nutrients needed by the human body and their effects on the human body;
3. Give examples of food sources of the seven major nutrients;
4. Give examples of the sources and deficiencies of inorganic salts and vitamins.
Food and Nutrition PPT, Part 2: Food and Energy
The main nutrients in food are:
1. Sugar
2. Fat
3. Protein
4. Water
5. Inorganic salt
6. Vitamins
7. Dietary fiber
think:
1. Are the energies contained in different foods the same?
2. Can we measure the amount of energy in food?
hint:
1. To measure the energy content of food, you can measure the heat energy released by burning the food;
The heat released by burning food = the energy produced by oxidation and decomposition in the body
2. The food selected must be flammable, such as peanuts, rice, beef jerky, etc.;
Food and Nutrition PPT, Part 3: The Role of Nutrients
(1) Sugar
Including starch, glucose, sucrose, maltose, etc.;
Source: sugar, rice, cereals, wheat, potatoes, roots and tubers
The function is:
1. The most important _____ substance in the human body;
2. It is also a component of _____.
(2) Protein
source
The protein content is higher in foods such as meat, eggs, fish, shrimp, dairy products and soybeans.
effect
1. It is the basic substance that constitutes _____;
2. Repair and renew __________ and damaged cells.
3. Can provide energy.
(3) Fat
Source: Foods such as vegetable oil, animal oil, walnuts and peanuts have high fat content.
effect:
Provides important substances for ______, but is often used
__________ substances are stored in the body.
Thinking expansion
Why do children, teenagers and the sick and wounded need to eat more milk, eggs, fish and meat?
Human growth and development, as well as the repair and renewal of damaged cells, are inseparable from protein. In addition, protein can also be broken down to provide energy for the body's life activities.
Food and Nutrition PPT, Part 4: Class Practice
1. Among the following substances of equal mass, the one that releases the most energy when decomposed in the human body is ()
A. Carbohydrates B. Fat C. Protein D. Vitamins
2. The energy substance for human life activities and maintaining a constant body temperature is ( )
A.Protein B.Carbohydrate
C. Fat D. Vitamin
3. The necessary elements to make up hemoglobin are ( )
A.Calcium B.Phosphorus
C. Iodine D. Iron
4. What can promote the normal development of the human body, enhance resistance, and maintain normal vision of the human body ( )
A.∨C B.∨D
C.∨A D.∨B1
Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, food and nutrition PPT download, .PPT format;
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"Food and Nutrition" PPT (second lesson):
"Food and Nutrition" PPT (Second Lesson) The first part of the content: review the past and learn new energy-supplying substances can be absorbed only after digestion. Sugar is the main source of energy needed by the human body. Protein is the main raw material for cell growth and tissue repair. Fat is the storage of energy in the body. .