Answer: The biconcave shape of erthrocytes is as a result of PERIPHERAL PROTEINS anchored to the inner surface of their plasma membrane.
Step-by-step explanation:
Erthrocytes or red blood cells are cells produced by the bone marrow which transport oxygenated blood through out the body. The biconcave shape of red blood cells is as a result of peripheral proteins anchored to the inner surface of their membrane plasma.
The biconcave shape increases the flexibility of erthrocytes which allow the red blood cells to travel through capillaries with tiny size of diameter, give the red blood cells large surface area and increase their abilities to transport oxygen.