SCIENCE
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Depolarizarion
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Repolarization
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Hyperpolarization
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Resting Potential
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Detailed explanation-1: -The repolarization or falling phase is caused by the slow closing of sodium channels and the opening of voltage-gated potassium channels. As a result, the membrane permeability to sodium declines to resting levels.
Detailed explanation-2: -During repolarization, potassium ions move out of the cell via potassium channels. This movement is down the concentration gradient to restore the charges across the cell membrane.
Detailed explanation-3: -After repolarization, the cell hyperpolarizes as it reaches resting membrane potential (−70 mV in neuron).
Detailed explanation-4: -To summarize, sodium ions (Na+) enter the nerve membrane during depolarization and potassium ions (K+) leave the nerve membrane during repolarization.