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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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11. Nervous Tissue and Nervous System
Action Potentials
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Which of the following is characteristic of an action potential?
A
absent of positive feedback
B
voltage-gated ion channels
C
occurs in the dendrites and cell body
D
travels a short distance
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Understand that an action potential is a rapid rise and fall in voltage or membrane potential across a cellular membrane.
Recognize that action potentials are primarily associated with the axon of a neuron, not the dendrites or cell body.
Identify that action potentials involve voltage-gated ion channels, which open in response to changes in membrane potential.
Note that action potentials are characterized by a positive feedback loop, where the initial depolarization leads to further depolarization.
Remember that action potentials can travel long distances along the axon, unlike graded potentials which travel short distances.
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