First slide

Human Respiratory System

Question

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

Moderate

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

Solution

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

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