Multiple Choice
Which of the following electrical events occurs when a certain threshold is reached?
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11. Nervous Tissue and Nervous System
Change in Membrane Potential
Back11. Nervous Tissue and Nervous System
Change in Membrane Potential
- Multiple ChoiceWhich of the following would be likely to cause depolarization of a neuron?
- Textbook Question
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.
1views - Textbook Question
What is the polarized membrane state? How is it maintained? (Note the relative roles of both passive and active mechanisms.)
5views - Multiple ChoiceDuring which phase of an action potential are voltage-gated K+ channels open, while voltage-gated Na+ channels are closed?1views
- 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
1views - Multiple ChoiceWhich of the following is characteristic of an action potential?2views
- Textbook Question
Since all APs generated by a given nerve fiber have the same magnitude, how does the CNS 'know' whether a stimulus is strong or weak?
3views - Textbook Question
What would happen if the drug blocked K+ channels instead?
- Textbook Question
A drug that blocks Na+ channels in neurons does so not only in the axon but also in the dendrites and cell body. What overall effect would this have on action potential generation?
- Multiple ChoiceAn action potential is a phenomenon that either happens completely or doesn't happen at all.4views
- Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
A local potential is a change in membrane potential that conducts the long-distance signals of the nervous system.
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