PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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For an action potential to take place the nerve impulse needs to reach:
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Quarter Stimulus
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Resting Potential
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Half Stimulus
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Threshold Stimulus
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Explanation:
Detailed explanation-1: -The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about-55 mV a neuron will fire an action potential. This is the threshold.
Detailed explanation-2: -Action potentials are triggered when an initial depolarization reaches threshold. This threshold potential varies, but generally is about 15 millivolts above the cell’s resting membrane potential, occurring when the inward sodium current exceeds the outward potassium current.
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