NEET Zoology Respiratory Organs MCQ Question
If the diaphragm and inter-costal muscles contract and the thoracic chamber volume increases by 500 mL, what will be the effect on intra-pulmonary pressure during inspiration?
It decreases to less than atmospheric pressure.
It increases to more than atmospheric pressure.
It remains equal to atmospheric pressure.
It fluctuates around atmospheric pressure.
Correct Answer
Detailed Explanation
An increase in thoracic volume causes pulmonary volume to increase, leading to a decrease in intra-pulmonary pressure below atmospheric pressure, thus causing inspiration.
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