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THE NERVOUS SYSTEM AND ENDOCRINE SYSTEM NERVOUS SYSTEM DIVISIONS OF NERVOUS SYSTEM Central Peripheral Contains the brain and Sensory and motor the spinal cord Communicates information to the rest of the body through the peripheral nervous system neurons throughout the rest of the body Takes information to and from the CNS to the extremities DIVISIONS OF THE PNS Autonomic Somatic Takes care of “automatic” Controls voluntary processes such as breathing, heart rate, muscles and glands Cannot control this Autonomic=automatic movement of the muscles Also known as the skeletal nervous system Somatic=SO Much Control AUTONOMIC NERVOUS SYSTEM Sympathetic Parasympathetic Deals with arousal Deals with calming When something is exciting, After something exciting the sympathetic nervous system brings you up Increases heart rate, breathing, dilates pupils Sympathetic=you feel for someone, your heart rate increases happens, the parasympathetic nervous system brings you back down Slows heart rate, stimulates digestion, contracts bladder Parasympathetic=parachute bringing you down AUTONOMIC NERVOUS SYSTEM Sympathetic and parasympathetic nervous systems work in an opponent process system They work in opposite of one another—as one is working, the other cannot work Work together to produce homeostasis (balance in the body) NEURAL NETWORKS Neurons work together in neural networks Neurons who have similar functions all cluster in similar areas and work together Works and improves by making more and better connections The more you do something, the better you become at it Neurons that fire together, wire together REFLEXES Reflexes are our bodies’ automatic responses to stimuli Sensory Neurons Gather Info We don’t feel it and we can’t make a decision about it Brain Processes Reflexes occur through the spinal cord You would move your hand from the flame, even if you had no head Motor Neurons React Only register pain after the info has reached your brain Interneurons speed the reflex arc along ENDOCRINE SYSTEM The slow messenger of the body Messages, in the form of hormones, take longer than NTs because they travel through the bloodstream Pituitary gland is the “master” gland Tells everyone else what to do…like a boss Adrenal glands release epinephrine and norepinephrine