First slide

Mechanism of Breathing

Question

During exhalation, the diaphragm is

Easy

A

relaxed and flat
B

contracted and flat
C

relaxed and arched downward
D

relaxed and arched upward

Solution

During inhalation the diaphragm contracts and becomes flat. This increases the volume of the thoracic cavity in the vertical axis. During exhalation, the diaphragm relaxes and arches upward which decreases the volume of the thoracic cavity in the vertical axis.

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