stimulus - a change in the environment, receptors - cells in sense organs that detect stimuli, sensory neurone - takes messages from the sense organs to the CNS, motor neurone - takes messages from the CNS to the effector, effector - muscle or gland that brings about a response, central nervous system - brain or spinal cord, acetylcholine - neurotransmitter in somatic and parasympathetic nervous system, synapse  - Junction between two nerves, electrical - Method of signal transmission along an axon, chemical - Method of signal transmission between neurones,

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