Which answer best describes the relationship between K+ movement and acid-base balance?
a. Excess extracellular H+ ions are exchanged for intracellular K+.
b. Extracellular acidosis results in serum hypokalemia.
c. Low-K+ diets are required following na-sogastric suctioning.
d. When the extracellular pH rises, K+ moves out of the cells.
ANS: A
Serum K+ concentration is determined primarily by the pH of extracellular fluid and the size of the intracellular K+ pool. In extracellular acidosis, excess H+ ions are exchanged for intracellular K+. Movement of K+ from intracellular to extracellular spaces may produce dangerous levels of hyperkalemia.
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