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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.
In connective tissue proper, the intercellular substance is soft, in cartilage it is firm yet flexible, in bone it is rigid due to the deposition of calcium salts, in blood it is fluid.Connective tissue in the embryo has quite a different structure and consistency from that in the adult. A large part of connective tissue proper is composed of extracellular material produced primarily by the fibroblasts. 2  The extracellular material consists of a gel-like substance called the ground substance, and fibers.