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STD 11 - 14. Breathing and exchange in gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
During forced expiration, actively contracting muscles include the
  • A
    Diaphragm
  • B
    External intercostals
  • ✓
    Abdominal muscles
  • D
    Diaphragm and intestinal muscle
✓

Answer

Correct option: C.
Abdominal muscles
c
(c) In forced expiration internal intercostal muscles and some abdominal muscles contract to reduce the volume of thorax.

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