<prompt> Biconcave shape of RBC is useful in all aspects except:Helps in passing through capillariesHelps in cellular metabolismIncreased surface area diffusion of gasesPrevent osmotic lysis  <response>: Ref: Pal GK. Red Blood Cells. In: Textbook of Medical Physiology. Ahuja Publishing House. 2007: 8: 63.Explanation:Advantages of biconcavity of RBCsWithstand lysis when exposed to hypotonic environmentBetter exchange of gasEasy movement through capillariesMetabolism in RBCNo nuclei, mitochondria, ribosomesTCA cycle is absentGlucose oxidation - 90 - Embden - Mayerhoff pathway: 10 - HMP shunt 