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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
Even when there is no air in the trachea, it does not collapse because of:
  • A
    Presence of chitinous rings
  • B
    Presence of bony rings
  • C
    Presence of cartilaginous rings
  • D
    Turgid pressure
✓

Answer

  1. Presence of cartilaginous rings

Explanation:

The trachea is surrounded by 'C' shaped cartilage rings to prevent it from collapsing and keep the trachea open for air to come in and out. In humans, there are about 15 to 20 incomplete C-shaped cartilaginous rings, which reinforces the anterior and lateral sides of the trachea to protect and maintain the airway open.

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