Cell membrane rest potential changed from -85 to -90 mV. It can be caused by activation of the following cell membrane channels:

Answer options

1. Potassium and calcium
2. Sodium
3. Calcium
4. Potassium
5. Potassium and sodium

Explanation

The resting membrane potential would be determined by the K+ concentration and be equal to the equilibrium potential for K+ ions (approx. : - 90 mV).