Q.

Which of the following part of the respiratory tract does not have cartilaginous rings in its wall ?

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a

Trachea

b

Primary bronchi

c

Secondary bronchi

d

Respiratory bronchioles

answer is D.

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Detailed Solution

Trachea, primary bronchi, secondary bronchi, tertiary bronchi and initial bronchioles are supported by incomplete cartilaginous rings. Respiratory bronchioles do not have these rings.

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