PEX-03-06. With a stimulus of 20 mV and a stimulus duration of 0.5 msec, there w
ID: 3478595 • Letter: P
Question
PEX-03-06. With a stimulus of 20 mV and a stimulus duration of 0.5 msec, there was one action potential produced. When the stimulus duration was increased to 500 msec, there were five action potentials recorded. Why?
Question options:
A)
With 500 msec the stimulus lasts longer than the relative refractory period allowing multiple action potentials to be generated.
B)
With 500 msec the stimulus lasts longer than the absolute refractory period allowing multiple action potentials to be generated.
C)
With 0.5 msec the stimulus lasts longer than the relative refractory period allowing multiple action potentials to be generated.
D)
With 0.5 msec the stimulus lasts longer than the absolute refractory period allowing multiple action potentials to be generated.
E)
The reason has nothing to do with the refractory period.
A)
With 500 msec the stimulus lasts longer than the relative refractory period allowing multiple action potentials to be generated.
B)
With 500 msec the stimulus lasts longer than the absolute refractory period allowing multiple action potentials to be generated.
C)
With 0.5 msec the stimulus lasts longer than the relative refractory period allowing multiple action potentials to be generated.
D)
With 0.5 msec the stimulus lasts longer than the absolute refractory period allowing multiple action potentials to be generated.
E)
The reason has nothing to do with the refractory period.
Explanation / Answer
The reason of this cause is the relative refractory period, which allows the nerve fibre to stimulate again by the next action potential. The refractive period is the interval between two stimuli.
The absolute refractory period does not allow making the fibre for next stimulation through action potential. However, here the cell gets 5 times stimulations; so only, the relative refractory period comes here.
Therefore, correct option is the first option –A
Answer- Option A
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