more sodium ions diffuse into the cell than potassium ions diffuse out of it. the inactivation gates of the voltage-gated sodium ion channels begin to open and the diffusion of sodium ions decreases. After the passage of the action potential, the sodium-potassium pump reestablishes the resting membrane potential.
Consequently, what is a voltage gated ion channel?
Voltage-gated ion channels are a class of transmembrane proteins that form ion channels that are activated by changes in the electrical membrane potential near the channel. The membrane potential alters the conformation of the channel proteins, regulating their opening and closing.
How does a sodium channel work?
Voltage-gated sodium channels play an important role in action potentials. If enough channels open when there is a change in the cell's membrane potential, a small but significant number of Na+ ions will move into the cell down their electrochemical gradient, further depolarizing the cell.
Do sodium ion channels require energy?
Ions pass through channels down their electrochemical gradient, which is a function of ion concentration and membrane potential, "downhill", without the input (or help) of metabolic energy (e.g. ATP, co-transport mechanisms, or active transport mechanisms).