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Mark the correct pair of muscles involve...

Mark the correct pair of muscles involved in the normal breathing in humans.

A

1. External and internal intercostal mus- cles

B

2.Diaphragm and abdominal muscles

C

3. Diaphragm and external intercostal mussles

D

4. Diaphragm and internal intercostal muscles

Text Solution

Verified by Experts

The correct Answer is:
d
During normal breathing 'only inspiration is an active process which is brought about by the diaphragm and external intercostal muscles. Normal expiration is a passive process which takes place by the recoil of the expanded lungs' and the relax- ation of the muscles of inspiration itself
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