NEET Zoology Respiratory Organs MCQ Question
If the diaphragm relaxes and the inter-costal muscles return to their normal positions, how does this affect the intra-pulmonary pressure compared to atmospheric pressure?
It becomes slightly higher than atmospheric pressure.
It becomes equal to atmospheric pressure.
It remains the same as before relaxation.
It becomes slightly lower than atmospheric pressure.
Correct Answer
Detailed Explanation
As the diaphragm and inter-costal muscles relax, the thoracic volume decreases, increasing intra-pulmonary pressure slightly above atmospheric pressure, causing expiration.
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