CONNECTIVE TISSUES: The tissues that either support or join one type of tissue to other, muscle to bone or bone to bone is called connective tissue. Location: Connective tissue is found throughout the body. It occurs in between different tissues and organs. It also forms sheaths around various organs of the body. Structure: The connective tissue consists of three basic components, i.e., matrix, cells and fibres. Except for the fluid connective tissue like blood and lymph, the fibres are abundantly found in the matrix of this tissue. The fibres forming the tissue are: (i) White fibres/Collagen fibres: They are most abundant, longer, thinner, inelastic, flexible, unbranched and wavy fibre. It is made up of collagen and hence is also known as collagen fibres. Collagen is digestible by pepsin. (ii) Yellow fibres/Elastic fibres: They are fewer, smaller, thicker, elastic, flexible, branched and straight fibres which occur singly. These fibres are formed of a protein called elastin. Provide elasticity. Elastin is digestible by trypsin.