NEET Zoology Respiratory Organs MCQ Question
What causes the increase in intra-pulmonary pressure during expiration?
Decrease in thoracic volume
Increase in diaphragm contraction
Expansion of alveolar sacs
Increase in atmospheric pressure
Correct Answer
Detailed Explanation
During expiration, relaxation of the diaphragm and inter-costal muscles leads to a decrease in thoracic volume, which subsequently reduces pulmonary volume. This reduction in volume causes an increase in intra-pulmonary pressure, forcing air out of the lungs.
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