| Select the correct events that occur during inspiration. [NEET 2020] [a] Contraction of diaphragm [b] Contraction of external inter-costal muscles [c] Pulmonary volume decreases [d] Intra pulmonary pressure increases |
A) [c] and [d]
B) [a], [b] and [d]
C) only [d]
D) [a] and [b]
Correct Answer: D
Solution :
| [D] Inspiration is initiated by the contraction of diaphragm, which increases the volume of thoracic chamber in the anterio-posterior axis. The contraction of external intercostal muscles increase the volume of the thoracic chamber in the dorsoventral axis. |
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