Question

During respiration the lungs always contains a residual volume of air. Why?​

Answer 1

Answer:

Explanation:

The residual volume functions to keep the alveoli open even after maximum expiration. ... Inspiration draws atmospheric oxygen into the lungs to replenish the oxygen-depleted residual air for gas exchange in the alveoli.

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Answer 2

Answer:

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Explanation:

Lungs always contain residual volume of air so that there will be sufficient time for inhalation (oxygen to be absorbed) after exhalation (carbon dioxide to be released.