Which statement best describes anemia?

• A. It is an abnormally high level of RBCs
• B. It is an abnormally low level of RBCs
• C. It is an abnormally high level of WBCs
• D. It is an abnormal platelet function

Answer: (B)

Anemia is a condition in which the blood has too few red blood cells (or not enough hemoglobin in them) to carry oxygen effectively to the body's tissues. Because red blood cells are the main carriers of oxygen, a lower-than-normal red blood cell count reduces oxygen delivery, leading to symptoms like fatigue, shortness of breath, and pallor. The opposite condition, too many red blood cells, is called polycythemia and can make the blood thicker and harder to pump. White blood cells are involved in fighting infection, so a high white blood cell count points to infection or inflammation rather than anemia. Platelets are key to clotting, so abnormal platelet function affects bleeding/clotting rather than oxygen transport. Therefore, the best description of anemia is an abnormally low level of red blood cells.