Question: What happens when a nodal cell's membrane returns to resting membrane potential? Need Assignment Help? Group of answer choices Voltage gates cation channels open, Na+ enters the cells and the membrane potential moves towards threshold. Voltage gates K+ channels open, K+ enters the cells and the membrane potential moves towards threshold. Voltage gates cation channels open, Na+ leaves the cells and the membrane potential moves towards threshold. Voltage gates K+ channels open, K+ leaves the cells and the membrane potential moves towards threshold.