The trachea is some sort of windpipe, it also carries air into your lungs. Some rings of cartilige hold the trachea open so that air can pass through it, and can allow you to breathe. The trachea is bendable and flexible. That allows lumps of food to pass down the esophagus. The trachea has a wall to stop it from being squashed by alot of pressure.
Air is forced out of the lungs back up the trachea and out though the nose or mouth.
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