AP PSYCHOLOGY

Detailed explanation-1: -After the neuron has fired, there is a refractory period in which another action potential is not possible. The refractory period generally lasts one millisecond. During this time, the potassium channels reopen and the sodium channels close, gradually returning the neuron to its resting potential.

Detailed explanation-2: -Once a neuron fires an action potential, there is a so-called refractory period. During this time, it is impossible for the neuron to generate another action potential.

Detailed explanation-3: -The relative refractory period (RRP) occurs during the hyperpolarization phase. The neuron membrane is more negatively-charged than when at resting state; K+ ion channels are only just starting to close.

Detailed explanation-4: -refractory period. noun. : the brief period immediately following the response especially of a muscle or nerve before it recovers the capacity to make a second response. called also refractory phase. see absolute refractory period, relative refractory period.

Detailed explanation-5: -Relative refractory period and threshold fatigue. Real neurons typically exhibit an absolute refractory period during which they will not fire and a relative refractory period during which the threshold for firing is elevated (Exercise 4.2 and Figure 15.3).