Question

actory Period Relative refractory period Inclass quiz question: Explain the reason why there is opposite effect on frequency of action potentials (excitability) during initial and later phases of hyperkalemia. 2 Time (msec) 3 4 Activity Details 

          actory Period
Relative
refractory
period
Inclass quiz question:
Explain the reason why there is
opposite effect on frequency of
action potentials (excitability)
during initial and later phases
of hyperkalemia.
2
Time (msec)
3
4
Activity Details
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actory Period Relative refractory period Inclass quiz question: Explain the reason why there is opposite effect on frequency of action potentials (excitability) during initial and later phases of hyperkalemia. 2 Time (msec) 3 4 Activity Details

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Biology for AP Courses
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Julianne Zedalis, John Eggebrecht
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Relative refractory period In-class quiz question: Explain the reason why there is an opposite effect on the frequency of action potentials (excitability) during the initial and later phases of hyperkalemia. Time (msec) Activity Details DII FB
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Transcript

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00:01 Hello everyone in this question we will be talking about the refractive period.
00:07 So a refractive period is the period of time after an action potential begins during an excitable cell and the cell cannot generate another action potential in response to a normal threshold stimulus.
00:32 There are two phases of the refractive period.
00:36 One is the absolute refractive period in which even a strong stimulus cannot initiate a second action potential.
00:49 The sodium channel that is inactivated must return to the closed state and then only the next action potential can be generated.
01:05 Whereas in the relative refractive period, this is the time during which the second action potential can be initiated.
01:18 But the stimulus must be larger than the normal.
01:24 And in this, the voltage gated potassium channel is open.
01:29 So action potential follow all or none principle.
01:36 So let us plot a graph in which the x -axis represents the time and the y -axis represents the membrane potential...
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