(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?
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Explanation:
a-the inner lining of nostril is lined by Nestle here when the air passes through the nasal passage the hair trap the dust particles and clean air enter in our body
b- it is supported by C shaped rings of capillaries which hold them in place when there is less air inside it so the wall of trachea do not collapse even there is a little
c-inhaled oxygen is removed from the alveoli to the blood in the capillaries and carbon dioxide moves from the blood in the capillaries so in this process the oxygen and the carbon dioxide separate during respiration
d-lungs maximise the area of gaseous exchange through the presence of large number of alveoli which are richly supplied with blood
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