103. Which of the following factors reduces the conduction velocity of an action potential in an axon? A) Decrease in axoplasmic resistivity B) Decrease in diameter of the nerve fiber C) Increase in the inward sodium current D) Myelination of the nerve fiber
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Step 1: The conduction velocity of an action potential in an axon is directly proportional to the diameter of the nerve fiber. Show more…
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All of the following are associated with the myelin sheath EXCEPT: A. faster conduction of nerve impulses. B. nodes of Ranvier forming gaps along the axon. C. increased magnitude of the potential difference during an action potential. D. saltatory conduction of action potentials.
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The speed of transmission of an action potential along an axon is influenced by a. the presence of myelin. b. an increased concentration of $\mathrm{Ca}^{2+}$ c. the diameter of the axon. d. all of the above. e. a and c only.
Sri K.
Saltatory conduction a. occurs only in myelinated nerve fibers. b. is slower than other types of nerve conduction. c. occurs only in the central nervous system. d. is the way an impulse gets from one neuron to another.
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