Why does a red blood cell have a biconcave shape?

Question

what is the function?

Answer 1

The 'dent' in each side of a red blood cell, like its small size, increases the amount of surface area in relation to the volume of the cell, giving it a large surface area to volume ratio. This large surface area means that oxygen can diffuse quickly into or out of the cell

Answer 2

To increase their surface area. Larger surface area means there is a larger area over which diffusion of oxygen can occur thus making the transfer of gas more efficient.

Answer 3

Hi gal its easy, to increase its surface area for carrying all the nutrients

in the body