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How Potassium Permeability Sets the Resting Membrane Potential

The single physiological fact the whole mechanism story rests on: open potassium channels drag the membrane voltage toward the potassium equilibrium potential, i.e. more open channels means a more negative cell. Without this, 'a potassium channel affects blood vessels' is magic.

Questions this Concept answers

Why does opening additional potassium channels hyperpolarise a resting cell?

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Resting Membrane Potential in Cell Physiology

A cell's resting membrane potential arises from unequal concentrations and differential permeability of charged ions (primarily K+, Na+, Cl-, Ca2+) across the cell membrane, maintained in part by the…