Mark the true statement among the following with reference to normal breathing.
(a) Inspiration is a passive process whereas expiration is active
(b) Inspiration is an active process whereas expiration is passive
(c) Inspiration and expiration are active processes
(d) Inspiration and expiration are passive processes
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The answer is the option (b) Inspiration is an active process, whereas expiration is passive.
Explanation: - Inspiration is an active process, but expiration is passive. Inspiration occurs because the diaphragm muscles contract to increase the volume of the thoracic cavity, but expiration leads to relaxation of the diaphragm muscles.