Galicia PAU Biology Practice Questions - Galicia PAU Biology (Biología Bioloxía 2o Bachillerato) Exam

Which extracellular buffer system is primarily responsible for maintaining human arterial blood pH near 7.40?

Phosphate buffer system (HPO4^2- / H2PO4-) Bicarbonate buffer system (HCO3- / H2CO3) Histidine protein buffer system Ammonium buffer system (NH4+ / NH3)

Correct Answer:

Bicarbonate buffer system (HCO3- / H2CO3)

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