Which term denotes production of red blood cells?

• A. Erythropoiesis
• B. Leukopoiesis
• C. Thrombopoiesis
• D. Erythrocytosis

Answer: (A)

Production of red blood cells is termed erythropoiesis. It happens in the bone marrow, starting from hematopoietic stem cells that commit to the erythroid line and mature through stages into reticulocytes and eventually erythrocytes. This process is driven by erythropoietin, a hormone mainly produced by the kidneys in response to low oxygen levels, which stimulates the maturation of red blood cells. Leukopoiesis is the production of white blood cells; thrombopoiesis is the production of platelets; erythrocytosis refers to an abnormally high red blood cell count, not the production process.