Key Points. 1  Megaloblasts are large nucleated RBC precursors with noncondensed chromatin. 2  The most common causes of megaloblastic, macrocytic anemia are deficiency or defective utilization of vitamin B12 or folate. 3  Do CBC, RBC indices, reticulocyte count, and peripheral smear.
vein. 1. Any of the blood vessels that carry blood toward the heart. Veins are thin-walled and contain valves that prevent the backflow of blood. All veins except the pulmonary vein (which returns to the heart from the lungs) carry blood having low levels of oxygen. 2.
A vein is a blood vessel or a distinctive style. Vain means self admiring or futile. (The term in vain means without success). A vane is a stabilizing fin or blade. The words vein, vain, and vane sound identical, but their meanings are very different. The noun vein has several meanings: A blood vessel that carries blood from the capillaries towards the heart. varicose veins A distinctive style or manner. A layer of ore or mineral between layers of rock.