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The trachea is a windpipe-a tough flexible tube that is about 12 centimeters long in adults. The larynx, which is positioned right above the tracheae, is connected to this windpipe with a flexible cartilage called the Cricoid cartilage. The lower parts of the trachea are flexible using Tracheal cartilages. They help a person bend to the sides and yet they don't restrict breathing. This material is made from cartilage and a few smooth muscle fibers for added strength.

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Q: What makes up the c rings of the trachea?
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