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Which of the following is passive process?

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in Biology – Class 11 by (272k points)
Which of the following is passive process?

(a) Inspiration

(b) Normal expiration

(c) Forceful inspiration

(d) Forceful expiration

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The origin of the question is Mechanism of Breathing-1 topic in division Breathing and Exchange of Gases of Biology – Class 11

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The correct answer is (b) Normal expiration

For explanation: Normal expiration is a passive process as during expiration, contraction (in any muscle) does not take place. Thus, there is no expenditure of energy. Relaxation in diaphgram and external intercoastal muscles is found.

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