Bronchioles are kept open by
A)rings of cartilage.
B)plates of cartilage.
C)skeletal muscle.
D)smooth muscle.
E)layers of epithelium.

Name: Bronchioles are kept open by A)rings of cartilage. B)plates of cartilage. C)skeletal muscle. D)smooth muscle. E)layers of epithelium.
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Question

Quizplus · Accepted Answer

Bronchioles are small airway branches that lack cartilage for support. The walls of bronchioles have smooth muscle that can contract or relax to control air flow and keep the airway open.

Bronchioles Are Kept Open by