Actionpotential+40Threshold-55FailedInitiations-70Resting stateStimulusRefractoryperiod1.3.Time (ms)The refractory period or the hyperpolarization phase of an action potential in aneuron, is due to which of the following ?the prolonged opening of Na+ channelsthe closure of Na+ channelsthe closure of K+ channelsthe prolonged opening of K+ channelsRepolarizationUonezuojoda0Voltage (mV)

Answered: Action potential +40 Failed nitlations…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

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Question

Action
potential
+40
Threshold
-55
Failed
Initiations
-70
Resting state
Stimulus
Refractory
period
1.
3.
Time (ms)
The refractory period or the hyperpolarization phase of an action potential in a
neuron, is due to which of the following ?
the prolonged opening of Na+ channels
the closure of Na+ channels
the closure of K+ channels
the prolonged opening of K+ channels
Repolarization
Uonezuojoda0
Voltage (mV)

Expert Solution

Explanation

Hyperpolarization is when the membrane potential is more negative than the membrane spot.

An action potential begins when depolarization increases the membrane potential enough to cross the threshold value of -55mV. This is followed by the opening of the Na⁺ gated channels which allows for the steep rise in potential upto +44mV. After a short time the sodium channels self inactivate with the potassium voltage gated channels opening to cause the rushing out of the potassium down it's electrochemical gradient. They remain open a little longer than is necessary which causes the undershoot to occur. Eventually, they close and the membrane potential returns back to normal.

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