C shaped cartilaginous rings are NOT found after

Bronchioles

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Tertiary bronchi

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Primary bronchi

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Secondary bronchi

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Solution

The correct option is D Bronchioles
Correct answer is A.
The C-shaped cartilaginous rings surrounds the anterior and the lateral sides of the trachea and the bronchi to protect the airway path. it is slight;y open (ie, C shaped in appearance) to allow the contraction of the trachea and the bronchi during coughing, and even swallowing. C-shaped rings are completely absent in the bronchioles.

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Cartilaginous rings are not present in______

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