The primary extracellular cation responsible for determining plasma osmolality is:
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Correct answer: Sodium
Sodium is the major extracellular cation and the main determinant of plasma osmolality. Changes in sodium concentration strongly influence water balance.
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More Electrolyte Balance questions
- Which hormone plays the most important role in renal sodium reabsorption in the distal nephron?
- Hyponatremia most commonly results from:
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- Which condition is most likely to cause hyperkalemia?
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- Which hormone directly increases renal potassium secretion?