NEET Zoology Respiratory Organs Assertion Reason Question
Assertion (A): The relaxation of the diaphragm and inter-costal muscles leads to expiration. | Reason (R): Expiration occurs when intra-pulmonary pressure exceeds atmospheric pressure.
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.
A is false.
Correct Answer
Detailed Explanation
The NCERT context describes that expiration is facilitated by the relaxation of the diaphragm and inter-costal muscles, which increases intra-pulmonary pressure above atmospheric pressure, explaining why air is expelled from the lungs.
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