Hyponatremia is defined by low levels of which electrolyte?

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Multiple Choice

Hyponatremia is defined by low levels of which electrolyte?

Explanation:
Hyponatremia means there is too little sodium in the blood. Sodium is the main extracellular electrolyte and helps regulate fluid balance between body compartments and support nerve and muscle function. When sodium falls below normal (typically under about 135 mEq/L), water can move into cells, including brain cells, causing swelling and symptoms like headache, nausea, confusion, or, in severe cases, seizures. In endurance activities, this can happen if someone drinks a lot of water without replenishing sodium. The other electrolytes—potassium, calcium, and magnesium—have their own distinct imbalances, but hyponatremia specifically refers to low sodium.

Hyponatremia means there is too little sodium in the blood. Sodium is the main extracellular electrolyte and helps regulate fluid balance between body compartments and support nerve and muscle function. When sodium falls below normal (typically under about 135 mEq/L), water can move into cells, including brain cells, causing swelling and symptoms like headache, nausea, confusion, or, in severe cases, seizures. In endurance activities, this can happen if someone drinks a lot of water without replenishing sodium. The other electrolytes—potassium, calcium, and magnesium—have their own distinct imbalances, but hyponatremia specifically refers to low sodium.

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