Which cation regulates intracellular osmolarity?
1: Sodium
2: Potassium
3: Calcium
4: Calcitonin
Answer:2: Potassium
Potassium is the cation that maintains the inside of the cells at an expected osmotic level. The potassium ions have a pivotal part in keeping the balance of water and solutes inside the cells, therefore, control of intracellular osmolality is taking place. K+ ion transference regulation by cells across membranes leads to the adjustment of the water content and therefore the maintenance of the necessary osmotic pressure
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