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JAMB Biology 2003 Question 25

Question 25

Nervous Coordination

Use the diagram of the neurone to answer: The point marked I is referred to as

Diagram for this question
  1. A.myelin sheath
  2. B.dendrites
  3. C.axon
  4. D.node of Ranvier.
Show the answer and explanation

Answer: D (node of Ranvier.)

Explanation

Point I is the gap between two sections of the myelin sheath along the axon. These gaps are nodes of Ranvier, where the impulse jumps from node to node.