NEET Zoology Respiratory Organs MCQ Question
If the thoracic volume increases by 500 mL during inspiration, by how much does the intra-pulmonary pressure decrease relative to atmospheric pressure to facilitate air entry into the lungs?
It decreases by 2-3 mmHg.
It decreases by 5-6 mmHg.
It decreases by 10-12 mmHg.
No change in pressure occurs.
Correct Answer
Detailed Explanation
The increase in thoracic volume during inspiration causes a decrease in intra-pulmonary pressure to less than atmospheric pressure, typically around 2-3 mmHg, facilitating air entry into the lungs.
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