(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 ?

(a) Explain how, the air we breathe in gets cleaned while passing thro

1.	(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 ?
Answer» (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 ?