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Q.

Why does the trachea not collapse when there is not much air? 

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a

 Having cartilaginous rings

b

Thick and muscular

c

 Have valves

d

 Supported by larynx

answer is A.

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Detailed Solution

The trachea is surrounded by 'C' shaped cartilage rings to prevent it from collapsing and keep the trachea open for air to come in and out. 

In humans, there are about 15 to 20 incomplete C-shaped cartilaginous rings, which reinforce the anterior and lateral sides of the trachea to protect and maintain the airway open. 

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