The biconcave shape of the RBCs is useful for all except
Biconcave shape provides large surface area to volume ratio necessary for rapid exchange of gases and diffusion of other substances across the RBC membrane. This flexible shape helps RBC to squeeze through very small capillaries. Considerable alteration in the cell volume is possible because of biconcave shape. This prevents RBCs from rupturing when increase in volume of cell occurs. Ref: Textbook of medical physiology by N Geetha, 3rd edition, page no. 76
Passing easily through smaller capillaries
Increased surface area for diffusion
Allows considerable alteration in cell volume
Resist hemolysis
Cardiovascular system