The trachea is prevented from collapsing by:

Muscular rings

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Cartilaginous rings

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Bony rings

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Chitinous rings

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Solution

The correct option is A Cartilaginous rings
The trachea is a rigid tube that conducts air from the larynx to the bronchi.
The rigidity of the trachea is maintained by a series of incomplete cartilaginous rings. These are arranged along the length of the trachea and are called C-shaped cartilage rings. These rings prevent the trachea from collapsing in the absence of air.
So, the correct answer is option B.

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Branches of the trachea that enter the lungs and are supported by cartilaginous bronchial rings are ___.

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