Most connective tissues are composed of ground substance, fibers, and cells, although blood and lymph are specialized fluid connective tissues without fiber.Ĭonnective tissue is largely organized into subcategories based on its nonliving components. Connective tissue is composed primarily of an extracellular matrix and a limited number of cells. Connective tissue contributes to numerous body functions, including supporting organs and cells, transporting nutrients and wastes, defending against pathogens, storing fat, and repairing damaged tissues.