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What is the function of the cartilaginous rings in trachea?

Answer:
The cartilage rings in the trachea prevent the trachea from collapsing during absence of air and also protect it.

these cartilagenous ring are C shaped and are meant for particular purposes such as

they give support and strength to the trachea
they prevent from collapsing and breaking
also cartilage contain much collagen fibres which are stress resistant
they don't allow the trachea to shrink

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