The delicate and fragile areolar connective tissue forms a soft packing around organs. Scar tissue is formed of connective tissue which fills in spaces where the original tissue does not regenerate. Several cellular and molecular components of connective tissue function in defense against invading bacteria or chemical substances. Inflammation is a defensive response of connective tissue at the site of infection or injury. The skull is a bony chamber which protects the soft brain tissue.
Blood is a connective tissue and it carries and delivers oxygen and nutrient to tissues.
Connective tissues are characterized by abundant amounts of extracellular matrix in which a variety of cell types are dispersed. The extracellular matrix between the cells usually includes fibers of one or more types embedded in an amorphous ground substance . 3- on the amount and nature of the amorphous ground substance that is present between its cells . Each of the major classes of connective tissue contains an undifferentiated cell type whose name ends in -blast . This cell retains its capacity for division and secretes the matrix that is characteristic of the tissue.