The Nervous System. The NERVOUS SYSTEM controls and coordinates functions throughout the body and responds to internal and external stimuli. NEURONS are cells that transmit messages, called IMPULSES , through the nervous system.
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The Brain Stem:
Light is focused through the LENS onto the RETINA. Images are transmitted from the retina to the brain through the OPTIC NERVE
THE KEY TO PREVENTING ADDICTION IS TO AVOID DRUGS.
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