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Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases1 Mark
MCQ
The structures participating in the inhalation are:
  • A
    Diaphragm and internal intercostal muscles
  • B
    Diaphragm and external intercostal muscles
  • C
    Abdominal muscles and intercostal muscles
  • D
    All of the above
✓

Answer

  1. Diaphragm and external intercostal muscles

Explanation:

During inhalation, the external intercostal muscles and diaphragm contract simultaneously. This causes the thorax to expand and inflates the lungs by creating a negative pressure inside the thoracic cavity. When inspiratory muscles contract, the diaphragm will descend and external intercostals will raise the rib cage. 

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