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Nervous System

nervous system controls all the other body systems; consists of brain, spinal cord, and network of nerves
nerve carries messages from inside or outside the body; messages pass from one to another
neuron special cells that carry impulses from the nervous system to different parts of the body (brain consists of millions of these)
autonomic carries out the activities of our body without thinking
brain core of the nervous system; collects information and makes decisions; basic functions controlled include breathing, movement, thinking, sleeping
cerebellum back of the brain; controls all body movement and maintain balance (voluntary responses)
cerebrum largest part of brain (2 halves); receives and interprets information from sense organs; aids in thinking and decision making
cornea protects the inner parts of the eye; has a curved shape which helps the eye focus objects as light passes through it
react response to what is going on around you; brain tells your body what to do
reflex perform automatically; natural reactions
voluntary response involve purposeful movement (fine motor movements, balance)
retina like the film in the camera; catches the image we see and sends it to our brain through the optic nerve
senses see (eye), hear (ear), smell (noes), taste (tongue), touch (skin); gather information outside your body and send messages to the brain
spinal cord main pathway for messages between the brain and rest of the body
spine made up of many bones called vertebrae; protects the spinal cord that carries messages to and from the brain
stimulus respond to a situation by changing what you are doing
medulla rests at the base of the brain connecting it to the spinal cord; controls heartbeat, digestion, and breathing (all involuntary responses)
involuntary response occur on their own and do not require thought (heartbeat, breathing, digestion)
brain stem controls involuntary action
Created by: crstone