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1. why are multiple action potentials generated in response to a long stimulus that is above threshold? Does it have to do with graded potentials?

2.what is the threshold relationship between the interspike interval and the frequency of action potentials. Cannot find this in the text anywhere.

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1. why are multiple action potentials generated in response to a long stimulus that is above threshold? Does it have to do with graded potentials?

The longer stimuli allow time for recovery and the above threshold allows the action potential to occur after the relative refractory period.
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2.what is the threshold relationship between the interspike interval and the frequency of action potentials. Cannot find this in the text anywhere.

The frequency milliseconds to seconds.
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