MHT CET Biology question

Biology Breathing and Exchange of Gases MHT CET

Expiration involves

(A)Relaxation of diaphragm and intercostal musclesCorrect
(B)Contraction of diaphragm and intercostal muscles
(C)Contraction of diaphragm and relaxation of intercostal muscles
(D)Contraction of intercostal muscles and relaxation of diaphragm

Answer: (A)

Solution

In normal expiration the diaphragm and external intercostal muscles relax, reducing thoracic volume

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Question ID VK-077940