Inspiration is initiated by - Vidyadip

MCQ

Inspiration is initiated by

A
Relaxation of the diaphragm
✓
Contraction of the diaphragm
C
Relaxation of the intercostal muscles
D
Contraction of the lungs

✓

Answer

Correct option: B.

Contraction of the diaphragm

b
Inspiration is initiated by the contraction of diaphragm, which increases the volume of thoracic chamber in the antero-posterior axis. The contraction of the external inter-costal muscles lifts up the ribs and the sternum causing an increase in the volume of thoracic chamber in the dorso-ventral axis. The overall increase in the thoracic volume causes a similar increase in the pulmonary volume

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