A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple Choiceabsolute refractory period.high concentration of sodium ions in the extracellular fluid.the high concentration of potassium ions in the cytoplasm.presence of receptor sites on the membrane.
Question
A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple Choiceabsolute refractory period.high concentration of sodium ions in the extracellular fluid.the high concentration of potassium ions in the cytoplasm.presence of receptor sites on the membrane.
Solution
The correct answer is the absolute refractory period.
Here's why:
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During an action potential, a neuron fires by allowing ions to pass through its membrane, changing the electrical charge inside the cell. This is called depolarization.
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After depolarization, the cell enters a state called the refractory period, during which it cannot fire again until it has returned to its resting state. This is to prevent the action potential from traveling backwards along the neuron.
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The absolute refractory period is the first part of this period, during which no amount of stimulation can cause the neuron to fire again. This is because the sodium channels, which opened to depolarize the cell, are inactivated and cannot be opened by any stimulus.
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The other options (high concentration of sodium ions in the extracellular fluid, the high concentration of potassium ions in the cytoplasm, presence of receptor sites on the membrane) do not prevent the generation of an action potential in a recently depolarized area of a cell membrane.
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