Why is it important that biconcavity of the erythrocyte on the cell decreases its flexibility?

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Biconcavity allows erythrocytes to have a large surface area to volume ratio, which is important for gas exchange. However, the biconcave shape also reduces flexibility, making the erythrocyte less prone to deformation and rupture in small capillaries. This is important to prevent hemolysis (destruction of red blood cells) and maintain proper circulation.

Why Is It Important That Biconcavity of the Erythrocyte on the Cell