Central Nervous System, The part of the nervous system made up of the brain and spinal cord. It processes information and coordinates responses., Peripheral nervous System, All the nerves outside the brain and spinal cord that carry messages between the body and the CNS., Sensory Neuron, A nerve cell that carries impulses from receptors to the CNS., Relay Neuron, A neuron found in the CNS that connects sensory neurons to motor neurons., Motor Neuron, A nerve cell that carries impulses from the CNS to muscles or glands., Reflex action, A quick, automatic response to a stimulus without conscious thought., Reflex arc, The pathway taken by nerve impulses during a reflex action., Synapse, A tiny gap between two neurons where signals are passed by chemicals., Neurotransmitter, A chemical released at a synapse to carry an impulse from one neuron to another., Sense Organ, An organ containing receptor cells that detect stimuli, such as the eye or skin., Hormone, A chemical messenger produced by glands and carried in the blood to target organs., Endocrine Gland, A gland that secretes hormones directly into the bloodstream., Homeostasis, The maintenance of a constant internal environment in the body..

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