Biology for IGCSE & O level - Coordination And Response (Section 2 - No. 16)
In a reflex arc, the correct sequence of events is:
Sensory neuron -> Effector -> Relay neuron -> Motor neuron
Receptor -> Sensory neuron -> Relay neuron -> Motor neuron -> Effector
Receptor -> Motor neuron -> Relay neuron -> Sensory neuron -> Effector
Effector -> Motor neuron -> Relay neuron -> Sensory neuron -> Receptor
Explanation
The correct sequence is receptor -> sensory neuron -> relay neuron -> motor neuron -> effector.
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