Q.

In human, contraction of diaphragm causes

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a

decreased intrapulmonary pressure

b

increased intrapulmonary pressure

c

decreased pulmonary volume

d

decreased thoracic volume

answer is A.

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Detailed Solution

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During inspiration, 

Contraction of diaphragm (diaphragm becomes flat)  Thoracic volume increases Intrapulmonary volume increases   Intrapulmonary pressure decreases  Air moves in

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