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Question
Biology
Asthma is caused due to:
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Q. Asthma is caused due to:
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A
infection of lungs
B
infection of trachea
C
bleeding into pleural cavity
D
spasm in bronchial muscles
Solution:
Asthma is a respiratory disorder due to spasm in bronchial muscles. The episodes may be precipitated by inhalation of allergens or pollutants, infection, cold air, vigorous exercise or emotional stress.