NEET Zoology Mechanism of Breathing MCQ Question
Which of the following statements about the mechanism of breathing are correct?
Inspiration involves an increase in thoracic volume, leading to decreased intra-pulmonary pressure, allowing air to flow into the lungs.
Expiration is primarily an active process that requires energy to push air out of the lungs.
The diaphragm and inter-costal muscles relax during inspiration, which aids in expanding the thoracic cavity.
The conducting part of the respiratory system includes structures that clear air from foreign particles and humidify it before it reaches the alveoli.
Correct Answer
Detailed Explanation
Inspiration involves an increase in thoracic volume which decreases intra-pulmonary pressure, allowing air to enter the lungs. Expiration is primarily a passive process. The diaphragm and inter-costal muscles contract during inspiration, not relax. The conducting part does clear and humidify air as it reaches the alveoli.
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