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Sagot :
An action potential which moves between the nodes of Ranvier during transmission of impulse, saltatory conduction occur in unmyelinated axons. Thus, option D is correct.
What is the role of axon?
In vertebrate nervous system, an axon, conducts electrical impulses known as action potentials away from the nerve cell body and transmit impulse to other neurons, muscles etc.
Two types of axons are present in human nervous system, such as myelinated and unmyelinated axons.
Myelin means a layer of a fatty insulating substance which surround the axon called as myelinated axon where as unmyelinated does not have fatty layer substance. Thus, option D is correct.
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