Which of the following elements plays a major role in maintaining fluid balance, electrolyte balance, and cell integrity, and is critical to maintaining the heartbeat?

Question

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Potassium plays a major role in maintaining fluid balance, electrolyte balance, and cell integrity, and is critical to maintaining the heartbeat. Sodium and chloride are also important electrolytes, but they do not have as significant of a role in maintaining the heartbeat as potassium does. Magnesium is important for many bodily functions, but it is not as critical for maintaining fluid and electrolyte balance as potassium.

Which of the Following Elements Plays a Major Role in Maintaining