Erythrocyte (Red Blood Cell)
An erythrocyte is a cell that contains hemoglobin and can carry oxygen to the body and is also called a red blood cell (RBC). The reddish color is due to the hemoglobin. Erythrocytes are biconcave in shape, which increases the cell’s surface area and facilitates the diffusion of oxygen and carbon dioxide. This shape is maintained by a cytoskeleton composed of several proteins. Erythrocytes are very flexible and change shape when flowing through capillaries becoming parachute shaped in order to fit through capillaries which are small in diameter than erythrocytes. Immature erythrocytes, called reticulocytes, normally account for 1-2 percent of red cells in the blood.