What is the primary component of cartilage?

The primary component of cartilage is collagen, particularly type II collagen. Collagen is a structural protein that provides strength and support to connective tissues, including cartilage. In cartilage, collagen fibers form a network that helps maintain its shape and resists compressive forces, which is crucial for its function in joints, allowing smooth movements between bones and providing cushioning.

Other components like chondroitin sulfate, elastin, and keratin play different roles in the body and are not the main structural component of cartilage. Chondroitin is part of the cartilage matrix but does not provide the structural framework to the same extent as collagen. Elastin is responsible for elasticity in tissues and is more prevalent in structures that require flexibility, such as skin and lungs, rather than the firm structure of cartilage. Keratin is a protein found in hair, nails, and the outer layer of skin, and does not have a role in cartilage composition.