Which of the following electrolytes plays a crucial role in regulating the amount of water in the body and maintaining proper blood volume?

A Sodium ✓
B Potassium
C Calcium
D Magnesium

Explanation

Sodium helps regulate the amount of water in the body and maintains proper blood volume. It does this by controlling the amount of water reabsorbed by the kidneys.

Mnemonic

Sodium = Salt = Water regulation

Source

Berne and Levy Physiology
Electrolytes and Acid-Base Balance Physiology Electrolyte Regulation Medium MEDICAL Confidence: high