Final answer:
The connective tissue cell that is a tissue macrophage is histiocyte. Macrophages are large cells derived from monocytes that engulf infectious agents and release cytokines to stimulate immune cells.
Step-by-step explanation:
The connective tissue cell that is a tissue macrophage is histiocyte. Macrophages are large cells derived from monocytes that enter the connective tissue matrix from the blood vessels. They are essential components of the immune system and are responsible for engulfing infectious agents and cellular debris. Macrophages release cytokines to recruit other immune cells and stimulate their activities in infected sites.