_____ is an ion found primarily in extracellular fluids.

Name: _____ is an ion found primarily in extracellular fluids.
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Ca2+ is primarily found in extracellular fluids, playing important roles in various physiological processes such as muscle contraction, neurotransmitter release, and blood clotting. The other ions listed, K+, Mg2+, Al3+, and Ba2+, are primarily found inside cells or in trace amounts in extracellular fluids.

_____ Is an Ion Found Primarily in Extracellular Fluids