Which of the following prevent collapsing of trachea?

Muscles

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Diaphragm

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Ribs

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Cartilaginous rings

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Solution

The correct option is D Cartilaginous rings
The cartilage rings in the trachea prevent the trachea from collapsing during the absence of air and also protect it. These cartilaginous rings are C-shaped.
So, the correct answer is option D.

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