Which mineral helps regulate fluid balance and supports nerve impulses?

Which mineral helps regulate fluid balance and supports nerve impulses?

• A. Calcium
• B. Potassium
• C. Sodium
• D. Magnesium

Answer: (B)

Potassium is essential because it acts as the main intracellular cation that keeps fluid balance inside cells and enables proper nerve signaling. The inside of cells requires a higher concentration of potassium than the outside, which helps maintain osmotic balance and the resting membrane potential. When nerves transmit signals, potassium movement across the cell membrane is crucial for restoring the membrane after an impulse, allowing the next signal to occur. This intracellular fluid balance paired with the ability to support nerve impulses is what makes potassium the best fit. Sodium regulates extracellular fluid and also participates in nerve impulses, but its strength here is its extracellular role. Calcium supports neurotransmitter release and other functions, while magnesium is a cofactor for many enzymes and supports general nerve function.

Potassium is essential because it acts as the main intracellular cation that keeps fluid balance inside cells and enables proper nerve signaling. The inside of cells requires a higher concentration of potassium than the outside, which helps maintain osmotic balance and the resting membrane potential. When nerves transmit signals, potassium movement across the cell membrane is crucial for restoring the membrane after an impulse, allowing the next signal to occur. This intracellular fluid balance paired with the ability to support nerve impulses is what makes potassium the best fit.

Sodium regulates extracellular fluid and also participates in nerve impulses, but its strength here is its extracellular role. Calcium supports neurotransmitter release and other functions, while magnesium is a cofactor for many enzymes and supports general nerve function.