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A-Level Biology OCR A

Neurones Motor Sensory Transmit Impulses Stimulus Response Relay Outline

A stimulus-response pathway involves sensory neurones transmitting signals from receptors to relay neurones (which relay signals between neurones), and then to motor neurones, which carry impulses to effectors.

A stimulus-response pathway involves sensory neurones transmitting signals from receptors to relay neurones (which relay signals between neurones), and then to motor neurones, which carry impulses to effectors.

Front Outline the steps in a stimulus-response pathway and identify the role of sensory, relay and motor neurones in this pathway.
Back Stimulus-response pathway:


  • Sensory neurones transmit impulses from sensory receptor cell to relay/motor neurone or brain
  • Relay neurones transmit impulses between neurones eg sensory and motor
  • Motor neurones transmit impulses from relay/sensory neurone to an effector

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