"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 3

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"Gas Exchange Occurring in the Lungs" Human Respiration PPT Courseware 3

1. Gas exchange between the lungs and the outside world

Experience and thinking

First place your hands lightly on both ribs and take a deep breath to feel the relationship between the movement of the ribs and the changes in the thorax; then place your hands lightly on the sternum and take a deep breath to feel the relationship between the movement of the sternum and the changes in the thorax.

think about it

When taking a deep breath - the ribs move upward and outward, and the thorax expands

When exhaling deeply - the ribs move downward and inward, and the thorax shrinks

Is this feeling accurate?

Small experiment:

Take a syringe, draw it to the end first, block the front end with your left hand, and push the syringe in with your right hand. What is the result? If you let go of your left hand, what will happen?

in conclusion

1. There is pressure in the gas.

2. For gases in a container, when the temperature remains constant, if the total amount of gas does not change, when the container volume increases, the gas pressure decreases; conversely, the gas pressure increases.

3. Gases always diffuse from places with high pressure to places with low pressure.

During the experiment, why do we need to alternately pinch or loosen the rubber tube with our hands?

When inhaling, pinch the rubber tube tightly with your left hand and loosen it with your right hand. The air in the upper layer of bottle A is sucked into the lungs, and the outside air enters the lime water through the open rubber tube;

When exhaling, pinch the rubber tube tightly with your right hand and loosen it with your left hand. The exhaled air enters the lime water in bottle B, and the upper air is discharged through the open rubber tube.

In this way, what enters bottle A of lime water is external air, and what enters bottle B of lime water is exhaled air.

What characteristics of the lungs are suitable for gas exchange?

1. Large number of alveoli

2. There are a large number of capillaries close to the alveolar walls.

3. The alveolar walls and capillary walls are very thin and are composed of only one layer of epithelial cells.

Try your hand

1. The structural and functional unit of the lung is ( )

A.Alveolar wall B.Capillaries

C. Alveoli D. Trachea

2. The muscles related to the rhythmic changes of the thorax are ( )

A. Chest muscles B. External intercostal muscles

C. Diaphragm D. External intercostal muscles and diaphragm

3. Regarding the structural characteristics of the lungs suitable for respiratory function, the incorrect statement is ( )

A. The alveolar walls are very thin and composed of a layer of epithelial cells.

B. The alveoli are surrounded by capillaries

C. The walls of capillaries are very thin and composed of only one layer of epithelial cells.

D. The lungs are located on both sides of the heart

summary

Gas exchange between the lungs and the outside world

Intercostal muscles and diaphragm → Contraction → Chest volume expansion → Lung expansion → Inhalation [Low compression within the lungs]

Intercostal muscles and diaphragm → relaxation → chest volume reduction → lung reduction → expiration [intrapulmonary pressure expansion]

What is aerobic exercise?

It refers to endurance exercise in which the metabolism in the body during exercise is mainly aerobic metabolism. Aerobic exercise can increase the body's oxygen uptake and improve cardiopulmonary function. It is the best way to achieve health effects.

Aerobic exercise includes walking (walking, brisk walking), jogging, playing ball, swimming, mountain climbing, cycling, aerobics, Tai Chi, etc.

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For more information about the PPT courseware "Human Respiration Occurs in the Gas Exchange in the Lungs", please click the "Human Respiration ppt Gas Exchange Occurs in the Lungs" ppt tag.

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Update Time: 2024-11-22

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