A large phagocytic cell found in tissues or at sites of infection is called?

• A. Leukopoiesis
• B. Megaloblasts
• C. Macrophages
• D. Morphology

Answer: (C)

Macrophages are large phagocytic cells that reside in tissues or migrate to sites of infection. They originate from monocytes in the blood and differentiate once they enter tissues. Their main roles are engulfing and destroying microbes and debris, presenting antigens to T cells to help kickstart adaptive immunity, and secreting cytokines that coordinate inflammation. This combination of being large, phagocytic, and tissue-resident at infection sites makes them the best answer. By contrast, leukopoiesis is the production of white blood cells, megakaryoblasts are precursors to platelets (not phagocytes), and morphology refers to the form of cells rather than a cell type.