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First: it is the "trunk" where air passes through to your bronchus and into your lungs (alveolar duct, alveolar sac, alveolus).

Second: the trachea are made up of C-shaped rings of tough flexible cartilage. These rings of cartilage protect the trachea, make it flexible, and keep it from collapsing or over-expanding.

Third: is the target for tracheal intubation, a medical procedure, for the critically injured. Allowing a medical provider to secure an open airway. Mainly because the trachea leads straight into the lungs.

Forth: Because the trachea is mainly flexible it allows the oesophagus (which is attached to the back of the trachea) to expand when a bolus of food is swallowed.

Fifth: The epidermal cells lining the trachea produce mucus which helps to capture things still in the air (fine dust and microbes). This is swept out of the air passageway by tiny ciliary cells, into the throat, where it is swallowed.

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13y ago

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