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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 multilayered 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.

1. Neurons are the chief functional units of the nervous system.
2. An ordinary neuron has a soma or cyton and a long thread called axon.
3. The myelin sheath is interrupted at the spaces between schwann cells to form gaps.
4. These gaps are called Nodes of Ranvier.

Correct answer: These gaps are called Nodes of Ranvier.

Solution

The passage states that the myelin sheath has interruptions between Schwann cells, and it explicitly names those interruptions as Nodes of Ranvier. So the correct choice is the statement that gives that name.

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