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What helps trachea open always when you breath std 9 in easy English ​

Answer» ONG>Answer:

cartilage

The WALLS of the trachea (TRAY-kee-uh) are strengthened by stiff rings of cartilage to keep it open. The trachea is ALSO lined with cilia, which sweep FLUIDS and foreign particles out of the AIRWAY so that they stay out of the lungs.

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