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Biology for IGCSE & O level - Coordination And Response (Section 9 - No. 44)

In a reflex arc, the correct sequence of events is:
Receptor -> Effector -> Sensory neuron -> Relay neuron -> Motor neuron -> Response
Receptor -> Sensory neuron -> Relay neuron -> Motor neuron -> Effector -> Response
Effector -> Receptor -> Sensory neuron -> Relay neuron -> Motor neuron -> Response
Receptor -> Motor neuron -> Relay neuron -> Sensory neuron -> Effector -> Response

Explanation

The correct order is: Receptor (detects stimulus) -> Sensory neuron (transmits impulse) -> Relay neuron (in CNS) -> Motor neuron (transmits impulse) -> Effector (responds) -> Response.

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