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Q.

In asthma, muscle spasm causes constriction of small bronchioles but not trachea because

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a

trachea has pseudostratified epithelium

b

trachea divides into primary bronchi

c

exchange of gases does not occur in the trachea

d

small bronchioles lack cartilaginous rings

answer is D.

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Detailed Solution

The trachea, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings.

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