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Physiology Quiz -
Refractory Periods of Neurons
Neuronal refractory periods occur after the onset of a neuronal action potential and represent a state of decreased neuronal excitability. Two types of refractory periods exist: absolute refractory period and relative refractory period. Test your basic knowledge of neuronal refractory periods by taking this simple quiz.
(1)   During this phase of the action potential, if a second stimulus is applied to the neuron (no matter how strong the stimulus), a second action potential will not be generated.



(2)   During this phase of the action potential, only a stronger than normal stimulus will lead to the generation of a new potential.



(3)   Which of the following is NOT true about the refractory period?
(4)   Which of the following is NOT true about the absolute refractory period?
(5)   In a typical vertebrate axon, the absolute refractory period is 1.0 ms and the relative refractory period is 4.0 ms. Thus, the axon is refractory for a total of 5.0 ms. If the axon is continuously stimulated with stimuli only large enough in amplitude to ensure excitation when the neuron is at rest, what is the highest frequency of action potentials that can be generated?
(6)   In a typical vertebrate axon, the absolute refractory period is 1.0 ms and the relative refractory period is 4.0 ms. If the axon is continuously stimulated with stimuli that can be adjusted in strength to be as strong as necessary to ensure excitation, what is the highest frequency of action potentials that can be generated
(7)   Which of the following is/are true of the absolute refractory period?
(8)   Approximately, how long is the absolute refractory period of neurons?
(9)   Approximately, how long is the relative refractory period of neurons?
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Posted: Wednesday, December 31, 2014