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Question: Answered & Verified by Expert
Which of these muscles are not involved in normal inspiration, normal expiration as well as forceful inspiration?
BiologyBreathing and Exchange of GasesNEET
Options:
  • A Internal intercostal muscles
  • B External intercostal muscles
  • C Diaphragm
  • D All three of these muscles
Solution:
1790 Upvotes Verified Answer
The correct answer is: Internal intercostal muscles
The contraction of external intercostal muscles and diaphragm is responsible for normal inspiration as well as forceful inspiration. Relaxation of these muscles causes normal expiration. The contraction of internal intercostal muscles is responsible for forceful expiration.

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