SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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For a neuron with a resting membrane potential at-70mv, an increase in the movement of sodium ions into the neuron’s cytoplasm would result in:
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the depolarization of the neuron.
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the repolarization of the neuron
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the replacement of potassium ions with sodium ions.
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the replacement of potassium ions with calcium ions.
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Explanation:
Detailed explanation-1: -The Sodium/Potassium Pump (ATPase) is responsible for maintaining the membrane potential at-70mv, the protein actively pumps three sodium ions out of the cell and pumps two potassium ions into the cell. The neurone becomes stimulated.
Detailed explanation-2: -If the membrane potential drops to below the normal resting state of-70mV, the neuron is hyperpolarized. Cells do not stay in a state of electrochemical neutrality because there is an uneven distribution of ions across a cell membrane.
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