Connective tissue is one of the four basic tissue types. It is made up of cells surrounded by non-living material including ground substances and fibres which are collectively known as extracellular matrix. Connective tissue supports and connects tissues and organs thereby giving them shape and holding them in place. Connective tissue can vary greatly in consistancy from loose to dense. There are several types of highly specialised connective tissue; both blood and bone are forms of connective tissue.