Which cells circulate in the blood and differentiate into macrophages in tissues?

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Multiple Choice

Which cells circulate in the blood and differentiate into macrophages in tissues?

Monocytes circulating in the blood differentiate into macrophages once they migrate into tissues. They originate in the bone marrow and patrol the bloodstream, then exit into sites of infection or injury where signals like M-CSF guide their maturation into macrophages. These tissue macrophages act as the resident phagocytes and antigen-presenting cells, clearing pathogens and debris and helping start immune responses. Lymphocytes are adaptive immune cells, neutrophils are short-lived first responders that remain as neutrophils, and eosinophils handle parasites and allergic responses, so they do not become macrophages.

Monocytes circulating in the blood differentiate into macrophages once they migrate into tissues. They originate in the bone marrow and patrol the bloodstream, then exit into sites of infection or injury where signals like M-CSF guide their maturation into macrophages. These tissue macrophages act as the resident phagocytes and antigen-presenting cells, clearing pathogens and debris and helping start immune responses. Lymphocytes are adaptive immune cells, neutrophils are short-lived first responders that remain as neutrophils, and eosinophils handle parasites and allergic responses, so they do not become macrophages.

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