Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A): The anatomical setup of lungs in the thorax is such that any change in the volume of the thoracic cavity will be reflected in the pulmonary cavity.
Reason (R): The movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere.
In light of the above statements, choose the correct answer from the options given below.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

Both (A) and (R) are false.

answer is B.

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Detailed Solution

Both (A) and (R) are true but (R) is not the correct explanation of (A).

The lungs are enveloped by pleural membranes, with the visceral pleura covering the lungs and the parietal pleura lining the thoracic cavity. Adhesion between these membranes creates a negative pressure system. Any change in thoracic volume results in a corresponding change in the pulmonary cavity due to the cohesive connection between the pleurae.

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