First slide

Human Respiratory System

Question

Which of the following structures doesn’t have cartilaginous rings?

Easy

A

Primary bronchi
B

Trachea
C

Primary bronchioles
D

Terminal bronchioles

Solution

Terminal bronchioles do not have cartilaginous rings to maintain their patency. Instead, they rely on elastic fibers attached to the surrounding lung tissue for support. Trachea, primary, secondary and tertiary bronchi, primary, secondary bronchioles are supported by incomplete cartilaginous rings.

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