Q.

Contraction of external intercostal muscles

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a

causes forceful expiration 

b

lowers the rib cage 

c

decreases thoracic volume 

d

decreases intrapulmonary pressure 

answer is C.

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Detailed Solution

Contraction of the external intercostal muscles helps decrease the pulmonary pressure to gulp more air into the lungs.

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Contraction of external intercostal muscles