Receptors: Detect a change in the environment (stimuli), Cells in sense organs, Light sensitive cells in the eye, Touch receptors in the skin, Coordination centres: Receives and processes information from receptors, Organises a response, Brain, Spinal cord, Effectors: Bring about a response, Muscles (which contract to cause movement), Glands (which secrete chemical substances), Salivary glands , Adrenal gland,

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