ANATOMY

Detailed explanation-1: -The refractory period in a neuron occurs after an action potential and generally lasts one millisecond. An action potential consists of three phases. Phase one is depolarization.

Detailed explanation-2: -The Action Potential The time during which the nerve is refractory to a second stimulus is called the absolute refractory period. It typically lasts for 1–2 ms. Following the absolute refractory period is a second, relative refractory period.

Detailed explanation-3: -By definition, the refractory period is a period of time during which a cell is incapable of repeating an action potential. In terms of action potentials, it refers to the amount of time it takes for an excitable membrane to be ready to respond to a second stimulus once it returns to a resting state.

Detailed explanation-4: -In electrocardiography, during a cardiac cycle, once an action potential is initiated, there is a period of time that a new action potential cannot be initiated. This is termed the effective refractory period (ERP) of the tissue.

Detailed explanation-5: -The relative refractory period is the period that occurs during the undershoot phase; where an action potential can be activated but only if the trigger (stimulus) is large enough.