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True or false: Torn cartilage heals slowly because it lacks a direct blood supply and nutrients have to be obtained by diffusion from the blood vessels in the surrounding perichondrium.
Answer: Cartilage is not innervated and therefore relies on diffusion to obtain nutrients. This causes it to heal very slowly. The main cell types in cartilage are chondrocytes, the ground substance is chondroitin sulfate, and the fibrous sheath is called perichondrium.
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