PHYSIOLOGY
NEUROTRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a neural impulse
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a level of stimulation needed to trigger a neuron
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a period of brief resting pauce after a neuron has fired
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the junction between the axon and the dendrite
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Detailed explanation-1: -In physiology, a refractory period is a period of time during which an organ or cell is incapable of repeating a particular action, or (more precisely) the amount of time it takes for an excitable membrane to be ready for a second stimulus once it returns to its resting state following an excitation.
Detailed explanation-2: -In its wake, the action potential leaves the Na+ channels inactivated and K+ channels activated for a brief time. These transitory changes make it harder for the axon to produce subsequent action potentials during this interval, which is called the refractory period.
Detailed explanation-3: -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-4: -An important characteristic of the action potential is the refractory period, which is the time after initiation of an action potential when it is impossible or more difficult to generate a second action potential.