"The release of energy in food" PPT

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"The release of energy in food" PPT

Part One: Which life activities of the human body require energy?

The energy needed by the human body comes from food

How energy in food is released

combustion

Explore: Differences in stored energy in different foods

food hot price

The energy released when each gram of food is fully burned outside the body.

formula:

Food caloric price = energy released (KJ)/food quality (g)

Release of energy in food PPT, part 2 content: Discussion:

1. How to measure the quality of food?

Weighing on balance

2. How to measure the energy released in food?

The energy in food can be released outside the body through combustion. 100g of water needs to absorb 4.187 joules (J) of energy to increase the temperature by 1°C. The energy in food can be measured and calculated by measuring the temperature at which a certain amount of water rises due to the heat released by a certain amount of food.

Discuss

1. Food can release heat during the burning process. What does this mean?

Food contains energy.

2. Why are the hot prices of different foods so different?

Different foods contain different amounts of energy. Foods containing more fat contain more energy, while foods containing more protein and starch contain less energy.

3. Does the caloric price of the food you measured match its actual caloric price? Why?

The food burned incompletely, heat was lost during the combustion process, and a small amount heated the test tube.

PPT on the release of energy in food, part three: thinking and discussion

1. In the experiment, walnuts released energy through violent combustion. However, do nutrients also need to be burned to release energy in cells?

2. The combustion process requires oxygen to support combustion, and does the process of releasing energy from nutrients in cells also require oxygen?

1. Put the burning candles into bottles A and C respectively, and record the burning time of the candles.

Phenomenon: A burning candle goes out faster when placed in a ( ) bottle.

Conclusion: Compared with air, the oxygen content of human exhaled gas is ( ).

2. Pour 50mL of clear lime water into bottles B and D respectively, and compare the turbidity of the liquids in the two bottles.

Phenomenon: () The lime water in the bottle appears turbid.

Conclusion: Compared with air, the carbon dioxide content of human exhaled gas is ( ).

PPT on the release of energy in food, part 4: Self-assessment:

1. The nutrients in food that can provide energy for human life activities are ( )

A. Water, fat, sugar B. Sugar, fat, protein

C, water, inorganic salts, vitamin D, sugar, fat, vitamins

2. Which of the following foods we eat contains the most protein ( )

A. Grapes B. Biscuits C. Vegetables D. Fish

3. The energy consumed by the human body in various life activities mainly comes from ( )

A. Fat B. Carbohydrate C. Protein D. Vitamin

4. Among the same amounts of food, which of the following foods releases the most energy when burned? ( )

A. Steamed buns B. Bread C. Peanuts D. Corn

5. Which of the following life activities does not require energy consumption (D)

A. Brain thinking B. Maintaining body temperature

C. Reading and writing C. Oxygen from the alveoli enters the blood

6. What is the total number of calories provided by 2000g of sugar, 150g of protein and 100g of fat?

Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, PPT download on the release of energy in food, .PPT format;

For more information about the PPT courseware "Energy Supply of the Human Body and the Release of Energy from Food", please click the "Energy Supply of the Human Body ppt Release of Energy from Food" ppt tag.

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Update Time: 2024-11-22

This template belongs to biology courseware Beijing Normal University Edition Seventh Grade Biology Volume 2 industry PPT template

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