MICROANATOMY

Detailed explanation-1: -The biconcave shape also provides a greater surface area across which gas exchange can occur, relative to its volume; a sphere of a similar diameter would have a lower surface area-to-volume ratio.

Detailed explanation-2: -Red blood cells have this biconcave shape to increase the available surface area so more oxygen can diffuse in and out of the cell.

Detailed explanation-3: -The larger surface area of RBCs provides more exchange of oxygen and carbon dioxide. Due to such a shape, RBC can swell easily and squeeze easily through small capillaries without any rupture or damage. Hence, the advantage of RBCs being biconcave is that it increases the surface area.

Detailed explanation-4: -The biconcave shape of the cell allows oxygen exchange at a constant rate over the largest possible area.

Detailed explanation-5: -RBCs have extremely thin membranes that allow the quick diffusion of oxygen. Due to the thin nature of the cells the oxygen diffuse easily and needs to travel a very short distance to reach the centre. The shape of the cells is biconcave which provides a large surface area for diffusion to occur efficiently.