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Which of the following is passive process?(a) Inspiration(b) Normal expiration(c) Forceful inspiration(d) Forceful expirationI got this question in quiz.The origin of the question is Mechanism of Breathing-1 topic in division Breathing and Exchange of Gases of Biology – Class 11

Answer»

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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