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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
  • a)
    (a),(b) and (d)
  • b)
    Only (d)
  • c)
    (a) and (b)
  • d)
    (c) and (d)
Correct answer is option 'C'. Can you explain this answer?
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Select the correct events that occur during inspiration.(a) Contractio...
Inspiration is initiated by contraction of diaphragm which increases volume of thoracic chamber in antero-posterior axis and contraction of external inter –costal muscles which lifts up the ribs and sternum causing increases in volume of thoracic chamber in dorsoventral axis.
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Select the correct events that occur during inspiration.(a) Contractio...


Contraction during Inspiration




Contraction of diaphragm: During inspiration, the diaphragm contracts and moves downwards, increasing the volume of the thoracic cavity. This allows more air to be drawn into the lungs.

Contraction of external intercostal muscles: The external intercostal muscles also contract during inspiration. This action lifts the ribs up and out, further expanding the thoracic cavity.

Pulmonary volume decreases: As the diaphragm contracts and the external intercostal muscles lift the ribs, the volume of the thoracic cavity increases. This expansion leads to a decrease in intrapulmonary pressure.

Therefore, during inspiration, the diaphragm and external intercostal muscles contract, leading to an increase in thoracic cavity volume and a decrease in intrapulmonary pressure.
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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 increasesa)(a),(b) and (d)b)Only (d)c)(a) and (b)d)(c) and (d)Correct answer is option 'C'. Can you explain this answer?
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