First slide

Mechanism of Breathing

Question

Inspiration is initiated by the

Easy

A

contraction of the diaphragm
B

relaxation of the diaphragm
C

contraction of the internal intercostal muscles
D

relaxation of the external intercostal muscles

Solution

Inspiration is initiated by the contraction of diaphragm which increases the volume of the thoracic chamber in the antero-posterior (vertical) axis.

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