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Following diagram indicates the mechanis...

Following diagram indicates the mechanism of breathing. Identify all the parts A, B, C and D correctly

A

A – Air expelled from lungs, B – Ribs and sternum raised, C – Diaphragm contracted, D – Volume of thorax decreased

B

A – Air expelled from lungs, B – Ribs and sternum raised, C – Diaphragm relaxed, D – Volume of thorax decreased

C

A – Air expelled from lungs, B – Ribs and sternum return to original position, C – Diaphragm relaxed, D – Volume of thorax decreased

D

A – Air entering into lungs, B – Ribs and sternum raised, C – Diaphragm contracted, D – Volume of thorax raised

Text Solution

Verified by Experts

The correct Answer is:
D

A - Air entering into lungs from the region of high pressure (atmosphere) to low pressure (lungs)
B – Contraction of external intercostal muscles pulls the ribs and sternum raised.
C - Contraction of phrenic muscles of the diaphragm
D – Thoracic cavity increases. And pressure decreases.
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