[A First Review of Basic Chemistry]

13. What is the importance of sodium (Na) in living cells?

A) Major component of the amino groups that make up proteins.

B) Major component of sugars.

C) Used in neurons (nerve cells) for the transmission of nerve impulses.

D) Needed to make hemoglobin, a molecule which carries oxygen in the blood.

E) Major component of water.

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Slichter