Fibroblasts: These are the most common cells in connective tissue and are responsible for synthesizing the ECM and collagen. Extracellular Matrix (ECM): Composed of proteins like collagen and elastin, as well as glycoproteins and proteoglycans, the ECM provides structural and biochemical support to surrounding cells. Blood Vessels: Capillaries, arterioles, and venules within the stroma ensure a steady supply of nutrients and oxygen. Immune Cells: Macrophages, mast cells, and lymphocytes are present to mediate immune responses and tissue repair.