Which electrolyte plays a crucial role in maintaining the resting membrane potential of neurons and is also involved in the regulation of blood pressure?

A Sodium
B Potassium ✓
C Calcium
D Magnesium

Explanation

Potassium plays a crucial role in maintaining the resting membrane potential of neurons and is also involved in the regulation of blood pressure through its effects on vascular smooth muscle cells.

Mnemonic

'B' for Brain, where Potassium helps maintain membrane potential

Source

Berne and Levy Physiology
Electrolytes and Acid-Base Balance Physiology Electrolyte Functions Hard MEDICAL Confidence: high