Which structure is composed of smooth muscle and no cartilage?
A) bronchioles
B) larynx
C) trachea
D) lumen
A
Explanation: A) Correct!
B) The larynx is not composed of smooth muscle.
C) The trachea is composed of cartilage.
D) The lumen is an opening, not smooth muscle.
Health & Biomechanics
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