Zoology-Respiratory Organs
NEET Zoology Respiratory Organs MCQ Question
Type: MCQ-numerical-Hard-Class 11
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?
A
It decreases by 2-3 mmHg.
B
It decreases by 5-6 mmHg.
C
It decreases by 10-12 mmHg.
D
No change in pressure occurs.
Correct Answer
Option A
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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