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Q.

Contraction of diaphragm

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a

decreases the thoracic volume in the vertical axis.

b

decreases the thoracic volume in the dorso-ventral axis.

c

increases the thoracic volume in the dorso-ventral axis.

d

increases the thoracic volume in the vertical axis.

answer is D.

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Detailed Solution

Contraction of diaphragm makes it flat and increases the volume of thoracic chamber in the vertical axis during inspiration. The contraction of external inter-costal muscles lifts up the ribs and the sternum causing an increase in the volume of the thoracic chamber in the dorso-ventral axis.

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