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Which of the following ions occur in biological fluids: Na+, Mg2+, Ca2+, K+, Sr2+, Li+ and Ba2+?

1. Mg2+, Ca2+, and Sr2+
2. Na+ and K+
3. Na+, K+, Mg2+ and Ca2+
4. Sr2+, Li+ and Ba2+

Correct answer: Na+, K+, Mg2+ and Ca2+

Solution

Na+, K+, Mg2+, and Ca2+ are essential ions that play critical roles in various physiological processes, including nerve transmission, muscle contraction, and maintaining fluid balance in biological systems.

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