A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple ChoiceAbsolute refractory periodPresence of receptor sites on the membraneHigh concentration of sodium ions in the extracellular fluidThe high concentration of potassium ions in the cytoplasm
Question
A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple ChoiceAbsolute refractory periodPresence of receptor sites on the membraneHigh concentration of sodium ions in the extracellular fluidThe high concentration of potassium ions in the cytoplasm
Solution
The correct answer is "Absolute refractory period".
Here's why:
The absolute refractory period is a time during which the neuron cannot generate another action potential no matter how strong a stimulus is given. This is because the sodium channels, which are necessary for the action potential, are inactivated. This period ensures that the action potential moves in one direction along the neuron and that neurons fire in a discrete manner.
The presence of receptor sites on the membrane, the high concentration of sodium ions in the extracellular fluid, and the high concentration of potassium ions in the cytoplasm are all important for the generation and propagation of action potentials, but they do not prevent a recently depolarized area of a cell membrane from generating an action potential.
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