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Q.

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

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a

Primary bronchi

b

Trachea

c

Primary bronchioles

d

Terminal bronchioles

answer is D.

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Detailed 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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