EMBRYOLOGY
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A “resting” motor neuron is expected to
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releases lots of acetylcholine.
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to have high permeability to sodium ions.
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to be equally permeable to sodium and potassium ions.
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have a higher concentration of sodium ions on the inside the cell than on the outside.
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exhibit a resting potential that is more negative than the “threshold” potential.
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Explanation:
Detailed explanation-1: -There is also a phase of the action potential during which time the membrane potential can be more negative than the resting potential. This phase of the action potential is called the undershoot or the hyperpolarizing afterpotential.
Detailed explanation-2: -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.
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