sodium-potassium pump

n.

The enzyme-based mechanism that maintains correct cellular concentrations of sodium and potassium ions by removing excess ions from inside a cell and replacing them with ions from outside the cell.

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What is Soft About a Soft Drink? What Does Soda Have to Do With Sodium?

Some call it soda. Others say soft drink, fizzy drink, soda pop, or just plain-old pop. There is no right word for the sweet carbonated beverage, although it would be wrong not to know the linguistic background behind the bubbles. That doesn’t mean we don’t have a thirst … for knowledge, that is. Why are soft drinks called soft? The “soft” in soft drinks is …