Which of the following mechanism help to exhale air out of the lungs?
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a
The relaxation of diaphragm
b
Contraction external intercostal muscle
c
The up lifting of sternum
d
Decrease in intra-pulmonary pressure
answer is A.
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Detailed 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.