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During normal inspiration...

During normal inspiration

A

Contraction of diaphram occurs which increase the volume of thoracic chamber in the antero-posterior axis.

B

Contraction of diaphram occurs which increase the volume of thoracic chamber in the dorso-ventral axis.

C

Contraction of external intercostal muscle occurs which increases the volume of thoracic chamber in the antero-posterior axis.

D

Contraction of internal intercostals muscle occurs which increases the volume of thoracic chamberin the dorso-ventral axis.

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The correct Answer is:
A
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