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The refractory period is when it is difficult to restimulate a region of a neuron during an action potential and for a little time after. It is divided into two phases: the absolute refractory period lasts from the start of the action potential until the cell returns to RMP, in which no stimulus can trigger a new action potential; the relative refractory period lasts until the end of hyperpolarization, in which a new action potential can be triggered only with an unusually strong stimulus.

The Refractory Period: The Real Reason Guys Need a Break Between Orgasms

Refractory Period: Why Guys Need a Break Between Orgasms | Greatist

The Refractory Period: The Real Reason Guys Need a Break Between Orgasms

Science explains why they're sidelined after one round—and what to do about. http://greatist.com/play/male-refractory-period

The Refractory Period: The Real Reason Guys Need a Break Between Orgasms

Science explains why they're sidelined after one round—and what to do about. http://greatist.com/play/male-refractory-period

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The fast pathway has a long refractory period whereas the slow pathway has a short refractory period. If a premature atrial beat occurs early enough to be in the refractory period of the fast pathway, conduction will not occur across this pathway, but conduction can still be possible by way of the slow pathway to reach the AV node. This begins a reentry tachycardia.

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