Q Which of the following ions is not abundant in extracellular fluids?
Question Info
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Explanation
Extracellular fluid is a body fluid that exists outside of cells. It includes interstitial fluid, plasma, lymph, and transcellular fluid. The primary ions present in extracellular fluid are sodium (Na+) and chloride (Cl-), followed by bicarbonate (HCO3-) and calcium (Ca2+). Potassium (K+), on the other hand, is the primary ion found inside cells, with only a small amount present in extracellular fluids. The concentration of K+ in extracellular fluids is tightly regulated because even small changes can affect important physiological processes like muscle contractions and nerve impulses. Therefore, option A is the correct answer as it is not abundant in extracellular fluids.
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