Why do rings of cartilage and mucus secreting cells present in trachea?
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In the trachea, or windpipe, there are tracheal rings, also known as tracheal cartilages. Cartilage is strong but flexible tissue. The tracheal cartilages help support the trachea while still allowing it to move and flex during breathing.
The trachea is lined with a moist mucous-membrane layer composed of cells containing small hairlike projections called cilia. The cilia project into the channel (lumen) of the trachea to trap particles. There are also cells and ducts in the mucous membrane that secrete mucus droplets and water molecules.
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The trachea is a cartilaginous tube formed by a series of tracheal cartilages, joined together by annular ligaments .These cartilages give the trachea rigidity and prevent its collapse.
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