WAEC Biology 2017 Objective — Question 18
Question 18 of 50 from the West African Examinations Council (WAEC) Biology 2017 Objective paper, with the correct answer and a full explanation.
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Which of the following sequences is the correct route of the transmission of impulses along a reflex arc?
- A. A. Receptor → sensory neurone → synapse → intermediate neurone → synapse → motor neurone → effectorCorrect
- B. B. Receptor → motor neurone → synapse → intermediate neurone → synapse → sensory neurone → effector
- C. C. Effector → intermediate neurone → synapse → motor neurone → synapse → sensory neurone → receptor
- D. D. Effector → motor neurone → synapse → sensory neurone → synapse → intermediate neurone → receptor
Explanation
The pathway of a reflex arc can be summarized as: Stimulus → Receptor → Sensory neurone → Intermediate neurone → Motor neurone → Effector.
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