"Human Energy Supply" PPT courseware

"Human Energy Supply" PPT courseware

Part One: Introduction of New Course

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 fighting beside the table or wrestling on the wrestling field... this series of activities It consumes a lot of energy from athletes. Where does this energy come from? How is it consumed?

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

Do you know who ultimately supplies energy to the human body?

What exactly happens to food in our bodies?

After food is digested and absorbed, nutrients are delivered to cells, and what happens next?

Purpose: Explain the energy supply of the human body.

guide:

1. Students work in groups of 4 to discuss and exchange the following information.

Information 1: The heat released when 1g of a substance is burned is called the heat price of the substance. According to measurements, the heat prices of protein, sugar and fat are 17.15kJ/g, 17.15kJ/g and 38.91kJ/g respectively. Various foods have different thermal prices due to their different ingredients.

Think: Which of the foods listed in the table has the highest thermal price? Which is the lowest? Why?

Peanuts have the highest heat price, and Chinese cabbage has the lowest heat price. Because peanuts contain more fat, Chinese cabbage mainly contains cellulose and inorganic salts, and less protein, sugar or fat.

Information 2: The energy a person needs in a day is related to his or her age, gender, body size and labor intensity

It can be seen from data 2:

The amount of energy a person needs in a day is related to his or her age, gender, body size, and intensity of labor. Generally speaking, adolescents are lower than adults, and low-intensity physical labor is lower than high-intensity physical labor.

2. Calculate your daily energy supply based on the "one-day recipe" designed when studying the "Dietary Guidelines and Food Safety" content.

Discussion: How to improve the "one-day recipe" proposed last time?

When designing a new "daily diet", attention should be paid to combining reasonable meals with daily energy consumption. For teenagers, it is necessary to not only meet the various nutrients necessary for body growth and development, but also to supplement the energy consumed by teenagers for normal physiological activities and physical activities.

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

What is body temperature?

Body temperature is the temperature inside the human body.

Where is the temperature taken?

What does the hospital use to measure body temperature?

thermometer

Measuring body temperature

Purpose: Try to measure body temperature.

Equipment: armpit thermometer, oral thermometer, absorbent cotton, 75% alcohol by volume, etc.

guide:

1. Students work in groups of 6 and measure each person’s armpit temperature and oral temperature.

2. Swing the mercury of the thermometer below the 35°C mark, and disinfect the thermometer with 75% alcohol by volume.

3. Place the mercury end of the thermometer into the armpit or mouth under the tongue. Record the thermometer reading after 5 minutes.

4. Based on the measurement results, record each person's armpit temperature and oral temperature in a list, and compare it with the body temperature of others.

Human energy supply PPT, part 4 content: thinking and discussion

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

According to the measurement site and the values ​​obtained after measurement, compared with the average temperatures of the armpit, oral cavity and rectum of normal people, the average values ​​of the armpit, oral cavity and rectum are 36.8℃, 37.2℃ and 37.5℃ respectively.

2. Why did airports, stations and other places use body temperature detectors to check the body temperature of passengers during the SARS epidemic?

Fever is a typical symptom of infectious diseases such as SARS, so suspicious patients can be screened by checking the body temperature of passengers.

What is the significance of 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 activity of enzymes in the body, thereby affecting the human body's life activities, and may lead to death in severe cases.

fever

When the human body is infected by certain bacteria or viruses, the body temperature will rise, which is commonly known as "fever".

Fever is both beneficial and harmful to the human body.

Fever within a certain limit is the body's physiological defense response against disease.

Excessive body temperature or long-term fever can disrupt the body's physiological functions and even be life-threatening.

When the body temperature reaches 43°C, a person's life may be in danger.

Human energy supply PPT, part 5: feedback 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.Apples

3. Except which one of the following, are all common parts for measuring body temperature ( )

A. Oral cavity B. Armpit C. Rectum D. Neck

4. The significance of maintaining normal body temperature for the human body mainly lies in ( )

A. Maintain the body’s energy

B. Keep the body energetic

C. Suitable for living in cold environments

D. Keep metabolism running normally

Expand and extend

Some people eat more in winter than in summer. Let’s try to analyze why.

When the temperature is low in winter, the heat lost directly through the body surface and indirectly through excretion activities increase relatively. In order to maintain normal body temperature, more heat needs to be released to supplement it. The heat comes from food, so food intake needs to be relatively increased.

Any human life activity requires energy consumption, but different people consume different amounts of energy in different activity states.

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:

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