The main buffer system of the human blood is
A. H2CO3 - HCO3
B. H2CO3 - CO32-
C. CH3COOH - CH3COO-
D. NH2CONH2 - NH2CONH+
Answer: Option A
Solution(By Examveda Team)
Bicarbonate buffer is the most important buffer system in blood plasma (generally in the extracellular fluid). This buffer consists of weak acid H2CO3(pK1 = 6,1) and conjugated base HCO3- (bicarbonate).This Question Belongs to General Knowledge >> Chemistry
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it should be HCO3-
note: the acid-base buffer system of human blood: a weak acid & it's conjugate base.
the weak acid = carbonic acid = H2CO3 (formed when carbon dioxide reacts with water)
the conjugate base = HCO3- (formed when carbonic acid dissociates)