A) axon
B) sperm
C) muscle fibre
D) neuron
Correct Answer: A
Solution :
Neurons are the structural and functional units of the nervous system. It consist of three parts i.e., cyton, axon and dendrites. axons may be myelinated (i.e., covered by myelin sheath) or unmyelinated. The unmyelinated gaps or constrictions in the Axons are called as nodes of Ranvier
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