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Hyperpolarization is a change in a cell's membrane potential that makes it more negative. Cells typically have a negative resting potential, with neuronal action potentials depolarizing the membrane. Cells typically have a negative resting potential, with neuronal action potentials depolarizing the membrane.
Hyperpolarization occurs because the slow-acting potassium channels take longer to deactivate, so the membrane overshoots the resting potential. It gradually returns to resting potential and is ready for another action potential to occur. During the action potential before the hyperpolarization phase, the membrane is unresponsive to any ...
Hyperpolarization has several meanings: Hyperpolarization (biology) occurs when the strength of the electric field across the width of a cell membrane increases Hyperpolarization (physics) is the selective polarization of nuclear spin in atoms far beyond normal thermal equilibrium
Hyperpolarization is the spin polarization of the atomic nuclei of a material in a magnetic field far beyond thermal equilibrium conditions determined by the Boltzmann distribution. [1] It can be applied to gases such as 129 Xe and 3 He , and small molecules where the polarization levels can be enhanced by a factor of 10 4 –10 5 above thermal ...
Hyperpolarization by the delayed-rectifier potassium channels causes a relative refractory period that makes it much more difficult to reach threshold. The delayed-rectifier potassium channels are responsible for the late outward phase of the action potential, where they open at a different voltage stimulus compared to the quickly activated ...
The researchers found that the re-polarization of cells happens because of BK channels and that a part of the after-hyperpolarization occurs because of current through SK channels. They also found that with blocking SK channels, current during after-hyperpolarization still occurred.
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The afterhyperpolarisation is one of the processes that contribute to the refractory period. Afterhyperpolarization, or AHP, is the hyperpolarizing phase of a neuron's action potential where the cell's membrane potential falls below the normal resting potential. This is also commonly referred to as an action potential's undershoot phase. AHPs ...