In cardiac muscle, the fast depolarization phase of the action potential is the result of.

In cardiac muscle, the fast depolarization phase of the action potential is the result of: Increases membrane permeability to sodium ions. calcium channels remaining open. the refractory period lasts until the muscle relaxes

Explanation:

there's the proffessional site that will you.

not sure if this is what you'r looking for eubacteria and archaebacteria