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Another type of connective tissue is cartilage which is a tough yet flexible solid extracellular tissue that is part of the skeletal system. Cartilage is used as padding between bones at the joints and is also used as flexible support for structures like the windpipe, nose, and ears.
The extracellular matrix of connective tissue is composed of ground substance and fibers. In ordinary connective tissue, the ground substance consists mainly of water. The principal fiber type is collagen (the most abundant protein in the body), with elastic fibers as a minor element.