Which of the following buffer system(s) is(are) important in human blood?

HC2H3O2/C2H3O2-
HPO42 -/H2PO4-
both (a) and (b)
neither (a) nor (b)

Answer:
If you had said H2CO3/HCO3- as A then both, but for acetate, I have to say:

B - neither

Although HPO4-2/H2PO4- IS a buffer in blood.
uh?
neither. Blood buffer system is mainly controlled by carbonate level.

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