Which electrolyte plays a crucial role in regulating the excitability of nerve and muscle cells, particularly in the context of action potential generation?

A Sodium (Na+)
B Potassium (K+) ✓
C Calcium (Ca2+)
D Magnesium (Mg2+)

Explanation

Potassium (K+) plays a critical role in regulating the excitability of nerve and muscle cells, particularly in the context of action potential generation, by helping to repolarize the cell membrane after depolarization.

Mnemonic

_K_ontrols _P_otential

Source

Berne and Levy Physiology
Electrolytes and Acid-Base Balance Electrolytes Potassium Homeostasis Hard NURSING Confidence: high