NEETBiologyBreathing and Exchange of GasesMCQ+4 / −1
Select the correct events that occur during
inspiration.
(i) Contraction of diaphragm
(ii) Contraction of external inter-costal muscles
(iii) Pulmonary volume decreases
(iv) Intra pulmonary pressure increases
(i) Contraction of diaphragm
(ii) Contraction of external inter-costal muscles
(iii) Pulmonary volume decreases
(iv) Intra pulmonary pressure increases
- AOnly (iv)
- B(iii) and (iv)
- C(i), (ii) and (iv)
- D(i) and (ii)
View written solutionFree
Correct answer: 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 inter-coastal 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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