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Question: Answered & Verified by Expert
Which one of the following process does not occur during inspiration in humans?
BiologyBreathing and Exchange of GasesNEET
Options:
  • A contraction of internal intercostal muscles
  • B contraction of phrenic muscles
  • C an overall increase in the volume of the thoracic chamber
  • D the intra-pulmonary pressure decreases than atm. pressure
Solution:
2966 Upvotes Verified Answer
The correct answer is: contraction of internal intercostal muscles
During inspiration, contraction of the external intercostal muscles between ribs and phrenic muscles of diaphragm occurs. Due to this, the volume of thoracic chamber increases from all sides and this also increases the pulmonary volume and therefore decreases pulmonary pressure than atmospheric pressure.

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