BIOLOGICAL BASES OF BEHAVIOR
THE NERVOUS AND ENDOCRINE SYSTEMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sodium ion will diffuse out of neurone
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Sodium pump is stimulated
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Sodium channel and potassium channel are closed
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Membrane potential changes from resting potential to action potential
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Detailed explanation-1: -Answer and Explanation: The correct answer is (c). When this occurs we call this an excitatory post synaptic potential or and EPSP. A normal resting potential for a neuron is around-70mV.
Detailed explanation-2: -[5] Depolarizing current from an action potential travels very rapidly through the cytoplasm of axons, insulated by myelin until reaching the next node of Ranvier. At each node, the membrane depolarizes above the threshold voltage, and the influx of sodium ions again initiates the action potential through Nav.
Detailed explanation-3: -During depolarization, the membrane potential rapidly shifts from negative to positive. For this rapid change to take place within the interior of the cell, several events must occur along the plasma membrane of the cell.
Detailed explanation-4: -During depolarization, the inside of the cell becomes more and more electropositive, until the potential gets closer the electrochemical equilibrium for sodium of +61 mV. This phase of extreme positivity is the overshoot phase.