Question

Concentration of carbonic acid does not increase in blood due to presence of

• A. Na${}^{+}$
• B. Mg${}^{2+}$
• C. Ca${}^{2+}$
• D. K${}^{+}$

Answer 1

The correct option is A Na${}^{+}$

Concentration of carbonic acid does not increase in blood due to presence of Na${}^{+}$. The bicarbonate buffering system of blood is an important buffer system in the acid-base homeostasis of living things, including humans. In plasma, by phosphate buffers, the alkaline phosphates combines with carbonic acid (H${}_2$CO${}_3$) and forms sodium bi carbonate.

Na${}_2$HPO${}_4$ + H${}_2$CO${}_3$ $\rightleftarrows$ NaH${}_2$PO${}_4$ + NaHCO${}_3$