Final answer:
The variation in the shape of erythrocytes is called poikilocytosis, which is seen in disorders like sickle cell disease where cells become sickle-shaped and can obstruct blood flow, leading to various health complications.
Step-by-step explanation:
Variation in the Shape of Erythrocytes
Variation in the shape of erythrocytes, or red blood cells (RBCs), is referred to as poikilocytosis. This condition can be exemplified by sickle cell disease, a genetic disorder characterized by the production of abnormal hemoglobin S. This abnormal hemoglobin causes erythrocytes to assume a sickle or crescent shape, particularly under low oxygen concentrations. This abnormal shape causes the cells to become lodged in narrow capillaries, leading to complications such as painful joints, delayed growth, blindness, and even strokes.
Here are the options and their definitions related to erythrocyte variations:
Therefore, the correct answer for the variation in the shape of erythrocytes is B. Poikilocytosis.