Question 48:
(a) Explain how, the air we breathe in gets cleaned while passing through the nasal passage.
(b) Why do the walls of trachea not collapse when there is less air in it ?
(c) How are oxygen and carbon dioxide exchanged in our body during respiration ?
(d) How are lungs designed in human beings to maximise the exchange of gases ?
Lakhmir Singh Biology Class 10
KIMGxb:
respiration
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a . by respiration
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(a) Our nasal cavity is lined with small hair like structures called cilia. It also produces a mucilaginous substance called mucus. Both cilia and mucus clean up the air we breathe in.
(b) The walls of trachea do not collapse when there is no air because they are attached with tracheal cartilage which supports it to stay in shape.
(c) When we inhale air, it enters the lungs and then move to the rest of the body through air blood barrier via capillaries similarly carbon dioxide from the blood enters the lungs and taken out.
(d) Lungs contain small grape like structures called bronchioles which expands the surface air and maximize the exchange of gases.
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