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A stimulus will stimulate receptors in sensory organs to produce electrical disturbances known as nerve impulses . These impulses are sent along the nerves to the brain. The brain receives the message and interprets it . Depending , on the message , it decides what to do . The brain sends nerve impulses to related effectors . 
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A nerve impulse is the relaying of a coded signal from a nerve cell to an effector (a muscle cell, a gland cellor another nerve cellin response to a stimulus. It is the means by which a nerve cell communicates with another cell. This signal is relayed along the axon of the nerve cell, bringing a message that instructs an effector to act. 
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