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Voltage-gated sodium channels have two gating mechanisms, the activation mechanism that opens the channel with depolarization and the inactivation mechanism that closes the channel with repolarization. While the channel is in the inactive state, it will not open in response to depolarization. The period when the majority of sodium channels ...
The channels are active during repolarization as well as during the atrial diastole phase when the current undergoes hyperpolarization. [14] Specifically, these channels are activated when Ca 2+ binds to calmodulin (CaM) because the N-lobe of CaM interacts with the channel's S4/S5 linker to induce conformational change. [ 15 ]
This phase is the repolarization phase. This occurs due to the inactivation of L-type calcium channels (preventing the movement of Ca 2+ into the cell) and the activation of potassium channels, which allows the flow of K + out of the cell, making the membrane potential more negative. [17]
After the action potential peak is reached, the neuron begins repolarization (3), where the sodium channels close and potassium channels open, allowing potassium ions to cross the membrane into the extracellular fluid, returning the membrane potential to a negative value.
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During phase 3 (the "rapid repolarization" phase) of the action potential, the L-type Ca 2+ channels close, while the slow delayed rectifier (I Ks) K + channels remain open as more potassium leak channels open. This ensures a net outward positive current, corresponding to negative change in membrane potential, thus allowing more types of K ...
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