A) Axolemma is discontinuous
B) Myelin sheath is discontinuous
C) Both neurilemma and myelin sheath are discontinuous
D) Covered by myelin sheath
Correct Answer: B
Solution :
Neurons are the chief functional units of the nervous system. An ordinary neuron has a soma or cyton and a long thread, called axon which is enclosed in a multilayeted myelin sheath, made by Schwann cells. The myelin sheath is interrupted at the spaces between Schwann cells to form gaps. These gaps are called nodes of Ranvier. These nodes and the myelin sheath create condition that speed up the nerve impulses.
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