Which ion is most responsible for the resting membrane potential (RMP)?

Options

1. Potassium (K+)
2. Calcium (Ca2+)
3. Sodium (Na+)
4. Chloride (Cl-)

Correct Answer

Potassium (K+)

Explanation

The resting membrane potential is primarily determined by potassium (K+) ions due to the high permeability of the membrane to K+ at rest and the concentration gradient maintained by the Na+/K+ ATPase pump.

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