Select the correct events that occur during inspiration. (a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases
(a) and (b)
(c) and (d)
(a), (b) and (d)
only (d)
Inspiration is initiated by the contraction of the diaphragm, which increases the volume of the thoracic chamber in the anterio-posterior axis. The contraction of external intercostal muscles increases the volume of the thoracic chamber in the dorsoventral axis.
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