Even when there is no air in it, human trachea does not collapse due to the presence of:

cartilaginous rings

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chitinous rings

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bony rings

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turgid pressure

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Solution

The correct option is C cartilaginous rings
The trachea is supported by c-shaped rings of cartilage which hold them in place when there is less air inside it. Due to this, the walls of trachea do not collapse even when there is a little air. So, the correct option is 'cartilaginous rings'.

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The air passage in the respiratory system of humans does not collapse due to presence of:

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