NEET Zoology Mechanism of Breathing MCQ Question
A diagram shows the thoracic chamber during inspiration, with labels indicating the position of the diaphragm and intercostal muscles. What occurs to the pulmonary volume during this phase of breathing?
It increases, allowing air to flow into the lungs.
It decreases, forcing air out of the lungs.
It remains constant, with no change in airflow.
It decreases, allowing air to flow into the lungs.
Correct Answer
Detailed Explanation
During inspiration, the thoracic chamber volume increases due to the contraction of the diaphragm and intercostal muscles, leading to an increase in pulmonary volume and a decrease in intra-pulmonary pressure, which allows air to flow into the lungs.
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