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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
Detailed Solution
Inspiration is initiated by the contraction of the diaphragm, which increases the volume of the thoracic chamber in the antero-posterior axis.
Contraction of the external intercostal muscles increases the volume in the dorso-ventral axis.
This increases pulmonary volume and decreases intra-pulmonary pressure, so air flows in.
So (a) and (b) are correct.