Biconcave shape of RBC’s is helpful because:: (A) Easily passage through capillaries, (B) Roulex formation., (C) Increased surface area for a given diameter., (D) None.
Answer is A. Guyton-419
Normal red blood cells, are biconcave discs having a mean diameter of about 7.8 micrometres and a thickness of 2.5 micrometres at the thickest point and 1 micrometre or less in the centre. The shapes of red blood cells can change remarkably as the cells squeeze through capillaries.