First slide

Mechanism of Breathing

Question

Relaxation of diaphragm and the inter-costal muscles

Easy

A

increases intrapulmonary pressure
B

decreases intrapulmonary pressure
C

increases the volume of thoracic chamber
D

causes inhalation of the air

Solution

Relaxation of the diaphragm and the inter-costal muscles returns the diaphragm and sternum to their normal positions and reduce the thoracic volume and thereby the pulmonary volume. This leads to an increase in intra-pulmonary pressure to slightly above the atmospheric pressure causing the expulsion of air from the lungs, i.e., expiration.

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