Stimulus - a change in the environment, CNS - the brain and spinal cord, Neurone - a nerve cell, Sensory neurone - carries impulses to the CNS, Motor neurone - carries impulses to an effector, Effector - a muscle or gland, Receptor - detects a stimulus, Reflex arc - pathway for a reflex action, Synapse - junction between two neurones, Homeostasis - balancing internal conditions,

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