A = Gas exchange continues non-stop in the lu | vedclass

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(C) is true: Gas exchange between the blood and the alveolar air occurs continuously because the lungs never completely collapse.$R$ is true: Even aft

Vedclass · Accepted Answer

Both $A$ and $R$ are true.

Vedclass · Answer

(C) is true: Gas exchange between the blood and the alveolar air occurs continuously because the lungs never completely collapse.$R$ is true: Even after a forceful expiration,some volume of air remains in the lungs,which is known as the Residual Volume $(RV)$.This residual air ensures that the lungs do not collapse and that gas exchange can continue even during the expiratory phase of breathing.Therefore,$R$ is the correct explanation for $A$.

$A =$ Gas exchange continues non-stop in the lungs even during exhalation.
$R =$ Lungs have residual air.

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$A =$ Gas exchange continues non-stop in the lungs even during exhalation.$R =$ Lungs have residual air.