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The main characteristic of cartilage is that it is firm and flexible. Cartilage is a type of connective tissue that provides support while also allowing for some degree of movement. This unique combination of firmness and flexibility makes it an essential component in various structures within the body, such as joints, the rib cage, ear, nose, and structures of the respiratory tract.

The flexibility of cartilage is largely due to its composition, which includes a gel-like matrix that contains collagen fibers, elastic fibers, and specialized cells called chondrocytes. This composition allows cartilage to absorb shock and withstand pressure while maintaining its shape. Additionally, the lack of blood vessels within cartilage contributes to its semi-rigid nature, as nutrients and waste products must diffuse through the matrix rather than being supplied directly through blood. This characteristic distinguishes it from bone, which is highly vascularized and rigid.

Overall, the ability of cartilage to remain firm yet flexible is crucial for its functions in the body, making it an important structural element.