Rings of cartilage present in the trachea ensure that
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(i) Rings of cartilage are present in trachea to prevent it from collapsing when less air is present in it. (ii) Lungs always contain a residual volume of air so that there is sufficient time to absorb oxygen and release carbon dioxide.
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(i) Rings of cartilage are present in trachea to prevent it from collapsing when less air is present in it.
(ii) Lungs always contain a residual volume of air so that there is sufficient time to absorb oxygen and release carbon dioxide.
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