Which statement describes the maturation pathway of monocytes?

Which statement describes the maturation pathway of monocytes?

• A. Maturing cells on their way from bone marrow to tissues where they form macrophages
• B. Secrete antibodies
• C. Transport oxygen
• D. Macrophages then function as long-lived phagocytes associated with chronic inflammation/infections

Answer: (A)

Monocytes originate in the bone marrow, enter the bloodstream, and migrate into tissues where they differentiate into macrophages. This maturation pathway—bone marrow origin, circulation, then tissue differentiation into macrophages—best describes how monocytes mature. Antibodies are produced by B cells, not monocytes. Oxygen transport is the job of red blood cells. Macrophages are long-lived phagocytes that reside in tissues and participate in responses to inflammation and infection, which describes their function after maturation rather than how monocytes mature.

Monocytes originate in the bone marrow, enter the bloodstream, and migrate into tissues where they differentiate into macrophages. This maturation pathway—bone marrow origin, circulation, then tissue differentiation into macrophages—best describes how monocytes mature. Antibodies are produced by B cells, not monocytes. Oxygen transport is the job of red blood cells. Macrophages are long-lived phagocytes that reside in tissues and participate in responses to inflammation and infection, which describes their function after maturation rather than how monocytes mature.