stimulus - The body detects this, receptors - These detect stimuli, effectors - These carry out responses, neurones - These carry messages, electrical - The messages in the neurones are, synapse - The gap between neurones is called, reflexes - These are quick so you don't hurt yourself, brain - Reflexes don't involve the..., chemical - The messages across the synapse are, muscles - Effectors that cause movement are...,

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