"Human Energy Supply" PPT

"Human Energy Supply" PPT

Part One: Situation Import

When climbing, the air at high altitudes becomes thinner and thinner, and we often feel flustered and short of breath; when we are hungry, we feel weak all over. Can you explain why?

learning target

1. Explain that the energy required for human life activities comes from the oxidative decomposition of organic matter in cells.

2. Explain the impact of changes in body temperature on the human body and the importance of maintaining a constant body temperature.

The supply of energy to the human body PPT, the second part: the supply of energy to the human body

The caloric value of food refers to the heat released when 1 gram of food is oxidized (or burned outside the body).

Determine the caloric price of different foods

1. Use a graduated cylinder to measure 30ml of distilled water, pour it into a large test tube, measure and record the water temperature T1

2. Weigh 1g of sample using a balance

3. Refer to the picture on the right to install the experimental device

【Communication and discussion】

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

Does not match. Because ① heat is lost during the combustion process ② test tubes and other devices absorb heat ③ food is not fully burned

Human body energy supply PPT, the third part: body temperature

Energy Utilization:

Maintain various life activities of the human body

lost as heat

——Maintain normal body temperature

discuss:

1. When you take the temperature of a loved one or neighbor, how do you confirm whether they have a fever?

2. Why did public places such as airports and stations have to use body temperature detectors to check the body temperature of passengers during the SARS epidemic?

What is the significance of the human body maintaining a relatively stable body temperature?

Maintaining a relatively stable body temperature is the basis for the human body to carry out normal life activities. Too high or too low body temperature will affect the catalytic function of enzymes in the body, thus affecting the human body's life activities, and in severe cases, death.

PPT on the supply of human energy, part 4: practice in class

1. The following nutrients that can provide energy to the human body are ( )

A. Water, fat, sugar

B. Fat, carbohydrate, protein

C. Water, inorganic salts, vitamins

D. Carbohydrates, proteins, vitamins

2. Among the following equal amounts of food, the one that releases the most heat when burned is ( )

A.Steamed buns B.Peanuts

C. Beef D. Apple

3. Various human activities require energy consumption. The following activities consume the most energy ( )

A. Singing B. Sweeping the floor

C. Walk quickly D. Cycling

4. The reason why people involuntarily "shiver" in a cold environment is due to ( )

A. Because of being afraid of the cold

B. "Shivering" maintains a balance between heat production and heat dissipation

C. The skin is stimulated by cold and the temperature decreases

D. Increase heat production and prevent body temperature from falling.

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware for the second volume free download, human body energy supply PPT download, .PPT format;

For more information about the PPT courseware "The Supply of Human Energy", please click the "Supply of Human Energy ppt" tab.

"Human Energy Supply" PPT courseware:

The first part of the PPT courseware "The Supply of Human Energy": The new lesson introduces an athlete, whether he is surfing on the sea or running on the track; whether he is fighting on the green field or playing chess on the chessboard; whether he is beside the table Sparring, or in the wrestling ring...