A) right atrium
B) dendrites
C) cell body
D) axon
Correct Answer: D
Solution :
A nerve fibre is sensu stricto, an axon together with its enveloping sheaths. The myelin sheath appears as a tube around the axon. Its name has been derived from the fact that it is filled with a complex mixture of lipids and proteins called myelin. At regular intervals (of about 1 mm in humans), the neurilemma is constricted and the myelin sheath is interrupted, forming the so-called nodes of Ranvier.
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