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The Nervous System Communication & Coordination Functions of the Nervorus System Communicate Information: From the outside world into the body and from within the body Coordinate Activity: Controls all of your body’s functions, both voluntary and involuntary Process 1. Sense organs (eyes, ears, mouth, nose, skin) bring in info to the brain 2. Other organs in the body send info to the brain 3. Brain processes information 4. Brain sends message for any activity ALL MESSAGING is performed by neurons, chemicals and electricity COMPONENTS Brain – the central processing unit of your body…all your body’s activities are controlled through your brain Spinal cord – a bundle of nerve fibers that relays messages to other parts of the body CENTRAL NERVOUS SYSTEM – brain and spinal cord PERIPHERAL NERVOUS SYSTEM – all nerves that branch away from the central nervous system Components… Meninges: fluid filled membranes that surround the spinal cord and brain – for protection Autonomic Nervous System This controls all automatic, involuntary functions such as body temperature control, heart beat, and breathing HAS TWO divisions, the SYMPATHETIC and the PARASYMPATHETIC Sympathetic Nervous System In response to information, this system gets the body ready for FIGHT or FLIGHT Pupils dialate Heart Rate increases as blood pressure increases Blood moves from organs to limbs in preparation for activity Endorphins are released Parasympathetic Nervous System This system restores equilibrium to the body and reverses the amping up the actions of the sympathetic Nervous System Somatic Nervous System This part of your nervous system controls ALL voluntary functions Actions you initiate Running or Scratching an itch Dancing, drawing, playing an instrument Doing CPR Interesting Facts Meningitis- a serious illness caused by a virus or bacteria in your meninges. Symptoms include high fever, aches, and head aches. Spinal injury-severed or damaged nerve; signals are not delivered past that point.