First slide

Mechanism of Breathing

Question

Contraction of diaphragm

Moderate

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.

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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