Multiple Choice
Which of the following best describes the propagation of depolarization down an axon?
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11. Nervous Tissue and Nervous System
Propagation of Action Potentials
Back11. Nervous Tissue and Nervous System
Propagation of Action Potentials
- Multiple ChoiceWhat ensures the one-way propagation of action potentials along an axon?81views
- Multiple ChoiceHow is an action potential propagated along an axon?120views
- Multiple ChoiceWhich of the following increases the speed of action potential propagation down the axon?80views
- Multiple ChoiceWhat structure distributes an action potential throughout the inside of a muscle fiber?83views
- Multiple ChoiceWhich of the following does not affect the speed of an action potential along an axon?78views
- Multiple ChoiceHow does an action potential move deep into the muscle cell?80views
- Multiple Choice
In unmyelinated axons, action potentials are propagated by_________ conduction.
965views16rank - Multiple Choice
Dr. Roberts is testing a new drug that blocks sodium channels in the axons of a neuron. Which of the following statements is correct?
941views21rank - Textbook Question
Would you expect to find larger motor units in the postural muscles of the back or the muscles of the hand? Explain your answer.
382views - Textbook Question
Explain why cardiac muscle cells and some smooth muscle cells will continue to contract even when their nerve supply has been removed
577views - Textbook Question
Which of the following statements best describes saltatory conduction?
a. Every section of the axolemma must be depolarized and triggered to generate an action potential.
b. The internodes must generate action potentials.
c. The dendrites and cell bodies propagate EPSPs toward the trigger zone.
d. Only the nodes of Ranvier must generate action potentials.
401views - Textbook Question
Identify the following as properties of electrical synapses (ES), chemical synapses (CS), or both (B).
a. ______ The plasma membranes of presynaptic and postsynaptic neurons are joined by gap junctions.
b. ______ Transmission is unidirectional and delayed.
c. ______ A presynaptic neuron and a postsynaptic neuron are involved.
d. ______ The use of neurotransmitters packaged into synaptic vesicles is required.
e. ______ Transmission is nearly instantaneous and bidirectional.
581views - Textbook Question
The trigger for exocytosis of synaptic vesicles from the presynaptic neuron is:
a. Arrival of an action potential at the axon terminal and influx of calcium ions.
b. Summation of IPSPs at the presynaptic neuron.
c. Binding of neurotransmitters to the axon hillock.
d. Influx of Na+ into the postsynaptic neuron.
356views - Textbook Question
Which of the following is not a method by which the effects of neurotransmitters are terminated?
a. Reuptake into the presynaptic neuron
b. Diffusion away from the synaptic cleft and uptake by glial cells
c. Movement back to the cell body by retrograde axonal transport
d. Degradation by enzymes in the synaptic cleft
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