NERVOUS
NEURONS TYPES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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During which stage of an action potential does sodium rush into the cell?
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depolarization
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hyperpolarization
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resting potential
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repolarization
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Explanation:
Detailed explanation-1: -depolarization: Also called the rising phase, when positively charged sodium ions (Na+) suddenly rush through open voltage-gated sodium channels into a neuron.
Detailed explanation-2: -Action potentials are caused when different ions cross the neuron membrane. A stimulus first causes sodium channels to open. Because there are many more sodium ions on the outside, and the inside of the neuron is negative relative to the outside, sodium ions rush into the neuron.
Detailed explanation-3: -During phase zero, the phase of rapid depolarization, voltage-gated Na+ channels open, resulting in a rapid influx of Na+ ions. Because of the influx of the cation, the membrane potential changes from-70mV to +50mV.
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