Amino acid responsible for buffering action of Hemoglobin: (A) Histidine, (B) Arginine, (C) Valine, (D) Lysine
Answer is A. The second buffer system is provided by the dissociation of the imidazole groups of the histidine residues in hemoglobin.Ref: Ganong&;s Review of medical physiology 25th edition. Page: 644