Intracellular pH is maintained primarily by the ____ and ____ buffer systems, and the extracellular pH by the ____ buffer system.
A) HPO42−/H2PO4−; HCO3−/H2CO3; histidine
B) H3PO4/H2PO4−; histidine; HCO3−/H2CO3
C) HCO3−/H2CO3; H3PO4/H2PO4−; histidine
D) HPO42−/H2PO4−; histidine; HCO3−/H2CO3
E) HCO3−/H2CO3; histidine; H3PO4/H2PO4−
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