11. Nervous Tissue and Nervous System
Action Potentials
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- Multiple Choice
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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When an action potential is at its peak, the electrical gradient forces potassium ____________.
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What happens when the neuron reaches threshold (-55 mV)?
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- Textbook Question
The anatomical region of a multipolar neuron where the AP is initiated is the
a. Soma
b. Dendrites
c. Axon's initial segment
d. Axon terminals
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What is the polarized membrane state? How is it maintained? (Note the relative roles of both passive and active mechanisms.)
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Describe the events that must occur to generate an AP. Relate the sequence of changes in permeability to changes in the ion channels, and explain why the AP is an all-or-none phenomenon.
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When admitted to the emergency room, Sean was holding his right hand, which had a deep puncture hole in its palm. He explained that he had fallen on a nail while exploring a barn. Sean was given an antitetanus shot to prevent neural complications. Tetanus bacteria fester in deep, dark wounds, but how do their toxins travel in neural tissue?
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