Final answer:
Aldosterone is the key hormone regulating blood K+ levels by enhancing sodium reabsorption and potassium secretion.
Explanation:
Aldosterone is the primary hormonal regulator of blood K+. It is a mineralocorticoid that acts on the kidneys to enhance Na+ reabsorption and K+ secretion, maintaining proper water balance by influencing ion levels. The release of aldosterone is stimulated by factors like blood sodium levels, blood volume, blood pressure, or blood potassium levels.
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