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The correct answer for this question is Action Potentials.
What is action potential?
An action potential is a recognizable pattern of fast voltage or membrane potential rise and fall across a cell membrane. A voltage response in a cell membrane must be initiated by sufficient current; if the current is insufficient to depolarize the membrane to the threshold level, an action potential won't fire. Neurons and muscle cells are two types of cells that communicate by way of action potentials.
The interval after an action potential is created during which the excitable cell is unable to generate another action potential is known as the refractory period. This epoch is divided into two subphases: absolute and relative refractoriness. Depolarization and around two-thirds of the repolarization phase are overlapped by absolute refractoriness.
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