NEET Zoology Mechanism of Breathing MCQ Question
Which of the following statements about the mechanism of breathing is correct?
During inspiration, the diaphragm contracts, increasing the volume of the thoracic cavity.
Expiration is achieved by the contraction of the intercostal muscles only.
Air moves into the lungs due to an increase in intra-pulmonary pressure.
The conducting part of the respiratory system is responsible for gas exchange.
Correct Answer
Detailed Explanation
Statement A is correct as the contraction of the diaphragm does indeed increase the thoracic cavity volume, leading to inspiration. Statement B is incorrect because expiration involves relaxation of both the diaphragm and intercostal muscles. Statement C is incorrect since air moves into the lungs due to a decrease in intra-pulmonary pressure. Statement D is also incorrect as the conducting part does not participate in gas exchange.
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