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11. Nervous Tissue and Nervous System

Action Potentials

11. Nervous Tissue and Nervous System

Action Potentials

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Casey is taking a new medication that blocks potassium channels. What stage of an action potential would be MOST affected by this drug?
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The CNS can discriminate between strong and weak stimuli as strong stimuli __________.
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What happens when the neuron reaches threshold (-55 mV)?
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Which part of the action potential occurs when the voltage-gated Na⁺ channels are inactivating and voltage-gated K⁺ channels open?
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Which of the following electrical events occurs when a certain threshold is reached?
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During which phase of an action potential are voltage-gated K⁺ channels open, while voltage-gated Na⁺ channels are closed?
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Which of the following is characteristic of an action potential?
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An action potential is a phenomenon that either happens completely or doesn't happen at all.
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When an action potential is at its peak, the electrical gradient forces potassium ____________.
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