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Connective tissue is a type of tissue in the body that has a supportive and structural function. It consists of cells embedded in an extracellular matrix (ECM). The ECM is a complex mixture of protein fibers (such as collagen and elastin), ground substance (a gel-like component consisting mainly of glycosaminoglycans and proteoglycans) and various other molecules that are essential for the structure, communication and protection of the cells within the tissue.
Connective tissue is found throughout the body and fulfills several important tasks. It supports and connects other types of tissue, protects organs, stores energy (in the form of fat), transports substances (for example in the form of blood, a fluid connective tissue) and plays a role in immune defense. Due to its composition and structure, connective tissue gives the body strength and elasticity.
There are different types of connective tissue, including loose connective tissue, tight connective tissue, adipose tissue, cartilage, bone and blood. Each of these forms has specific functions and properties that depend on the composition of its extracellular matrix and the type and arrangement of its cells. The versatility of connective tissue and its extracellular matrix enables it to fulfill different requirements in terms of supporting and connecting functions in the body.
