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

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
Asthama is a respiratory disease caused by
  • A
    Infection of trachea
  • B
    Infection of lungs
  • C
    Bleeding into pleural cavity
  • ✓
    Spasm in bronchial muscle
✓

Answer

Correct option: D.
Spasm in bronchial muscle
d
(d)In asthma, the allergen reagin reaction occurs in the bronchioles of the lungs. During this reaction, mast cells release a substance which causes muscular spasm.

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