Erythropoietin stimulates bone marrow for which purpose?

• A. White blood cell production
• B. Red blood cell production
• C. Platelet production
• D. Stem cell mobilization

Answer: (B)

Erythropoietin’s main job is to signal the bone marrow to produce more red blood cells in response to low oxygen levels. This increases the number of circulating red cells to improve the blood’s oxygen-carrying capacity. It does not drive white blood cell or platelet production, nor does it mobilize stem cells; those processes are governed by other factors such as colony-stimulating factors for leukocytes, thrombopoietin for platelets, and agents that mobilize stem cells (like G-CSF). In clinical use, erythropoietin is used to treat anemia by boosting red cell mass, such as in chronic kidney disease, with attention to risks if hemoglobin rises too quickly.