A biology teacher in Guyana demonstrates a reflex arc using a model. Which sequence correctly shows the pathway of a nerve impulse during a simple spinal reflex?

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Question

A biology teacher in Guyana demonstrates a reflex arc using a model. Which sequence correctly shows the pathway of a nerve impulse during a simple spinal reflex?

Accepted Answer

Receptor → Sensory neurone → Relay neurone → Motor neurone → Effector — Award 1 mark for B. This is the correct sequence for a spinal reflex arc. A is incorrect — motor and sensory neurones are reversed. C is incorrect — the pathway starts at the receptor, not effector. D is incorrect — relay neurone does not come before sensory neurone.

Answer

Receptor → Relay neurone → Sensory neurone → Motor neurone → Effector

Answer

Effector → Sensory neurone → Relay neurone → Motor neurone → Receptor

Answer

Receptor → Motor neurone → Relay neurone → Sensory neurone → Effector

Answer

Receptor → Sensory neurone → Relay neurone → Motor neurone → Effector

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