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Q.

Which of the following events occurs during inspiration?

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a

Decrease in thoracic volume

b

Lowering of the rib cage

c

Contraction of the diaphragm

d

Increase in intrapulmonary pressure

answer is D.

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Detailed Solution

Contraction of the diaphragm makes it flat, leading to an increase in the volume of the thoracic chamber in the vertical axis. 

During inhalation, ribs and sternum get raised, thoracic volume increases and intrapulmonary pressure decreases.

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Which of the following events occurs during inspiration?