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WAEC Biology 2011 Question 18

Question 18

Nervous Coordination

Which of the following neurons may not have myelin sheath?

  1. A.Effector cells
  2. B.Intermediate neurons
  3. C.Motor neurons
  4. D.Sensory neurons
Show the answer and explanation

Answer: B (Intermediate neurons)

Explanation

Sensory and motor neurons carry impulses over long distances and are myelinated. Relay (intermediate) neurons are short and lie inside the central nervous system, and many have no myelin sheath.