Inspiration is contraction of

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external intercostal muscles

internal intercostal muscles

internal intercostal muscles and diaphragm

external intercostal muscles and diaphragm

answer is C.

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Detailed Solution

Inspiration is initiated by the contraction of diaphragm which increases the volume of thoracic chamber in the antero-posterior axis. 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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