NEET Zoology Mechanism of Breathing MCQ Question
Which of the following statements correctly describe the mechanism of breathing?
Inspiration is caused by a decrease in thoracic volume, leading to lower intra-pulmonary pressure.
Expiration occurs when the diaphragm and inter-costal muscles relax, decreasing thoracic and pulmonary volume.
The conducting part of the respiratory system is primarily responsible for gas exchange.
During inspiration, atmospheric pressure is greater than intra-pulmonary pressure, causing air to flow into the lungs.
Correct Answer
Detailed Explanation
Statement B accurately describes the process of expiration as detailed in the NCERT context, where relaxation of muscles leads to decreased volume and increased pressure. Statement A is incorrect because inspiration is associated with an increase in thoracic volume, not a decrease. Statement C is also incorrect as the conducting part does not participate in gas exchange. Statement D correctly describes the pressure dynamics during inspiration, but does not fully capture the essence of breathing mechanics compared to statement B.
Found an issue with this question?
Related Questions
More from Mechanism of Breathing
More from
Assertion (A): Exchange of O2 and CO2 occurs between alveoli and deoxygenated blood. | Reason (R): Breathing involves both inspiration and expiration ...
What is the primary role of the enzyme carbonic anhydrase in the process of gas exchange?
Which of the following statements about the human respiratory system is correct?