Instructions

What causes the repolarization phase of the action potential? Na+ being pumped out of the cell by the Na+/K+ ATPase pumps. K+ being pumped into the cell by the Na+/K+ ATPase pumps. Na+ exiting the cell through voltage-gated ion channels, K+ exiting the cell through voltage-gated ion channels. 1 pts Question 3 What causes the refractory period and thus the unidirectional flow of the action potential? ligand-gated Na+ channels continue to be activated. OO Inactivation gates of the K+ channels stop protons from moving back in K+ channels are slow to close and the Na+/K+ ATPase activity takes time to restore ion concentrations

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