"What happens when you exercise (1)" Our body PPT courseware

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"What happens when you exercise (1)" Our body PPT courseware

Measure the number of breaths in one minute

1. The first measurement: the number of breaths in one minute at rest.

2. The second measurement: the number of breaths one minute after exercise.

3. Compare these two data and discuss your findings.

Experience activity: Breathe the same bag of air repeatedly

1. Fill a bag of air.

2. Seal your mouth and nose with the mouth of the bag and breathe repeatedly.

3. Stop if you feel uncomfortable.

4. Tighten the air in the bag to prevent it from escaping.

What happened to the gas?

Scientific principles:

Matches require oxygen to burn. When there is insufficient or no oxygen, a burning match goes out.

Experimental steps:

1. Collect one bottle each of normal air and air after repeated breathing.

2. Put the lit matches into the gas respectively and cover them with glass pieces.

3. Observe the phenomenon carefully and analyze the reasons.

The number of breaths increases after exercise. Why?

During human exercise, a large amount of oxygen needs to be consumed, so the number of breaths is more than usual, and the amount of exhaled and inhaled gas is also larger than usual.

vital capacity

Vital capacity refers to the total amount of air that can be exhaled after inhaling with all one's strength.

The greater the lung capacity, the stronger the breathing ability.

Regular exercise will increase our lung capacity and obtain more oxygen.

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Update Time: 2024-11-22

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