- Receptor in sense organs detect the stimulus, electrical impulses sent along sensory neurons (Nerves) to the CNS (Spinal cord + brain)
- CNS, sensory neuron passes message to relay neurons through the gap called the synapse (chemicals pass the message)
- Real neurons pass the message to the motor neuron which goes to the effector
- These reactions happen very quickly as it has to be an automated response
- They happen quickly as they do not pass through the conscious part of the brain.