First slide

Mechanism of Breathing

Question

Which of the following mechanism help to exhale air out of the lungs?

Easy

A

The relaxation of diaphragm
B

Contraction external intercostal muscle
C

The up lifting of sternum
D

Decrease in intra-pulmonary pressure

Solution

Expiration is caused by;
relaxation of the diaphragm and the inter-costal muscles,
reduction in thoracic volume and thereby the pulmonary volume,
increase in intra-pulmonary pressure to slightly above the atmospheric pressure.

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