Nervous System Ch 50
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Transcript of Nervous System Ch 50
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Nervous SystemCh 50
The brain & friends
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Purpose•Communication•Relays _______•______ changes inside and out
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Basic Cell•______–Sends signals called impulses
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3 types of neurons•______: eye to brain•Motor: Brain-spine-muscles
•________: Connects the other Two
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Neuron Parts•____
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•______
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•_____
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•___________
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Myelin _____•Made by _______ cells
•conducts impulses _____
• Increases w/ smarts•_____ substance
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______ Potential•Na+ is allowed in
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Threshhold•Strength of a ________ to cause a response–Ex. toilet flush model
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Synapse• Information passage
•_______ signals–_________ _________
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Divisions of the Nervous system•_______ NS
–Brain & spinal cord•________ NS
–Everything else–______ to CNS and Efferent
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Brain (preview page)•Parts–________–Cerebral cortex–________–Brain stem
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Cerebrum•_____ part–All _______ activity•Intelligence, learning…
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4 lobes •______•Parietal•_______•occipital
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2 hemispheres•L&R control ______ side of body
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cerebral cortex•Outer layer–“____ matter”
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Cerebellum
•____________•Learning a new physical activity difficult
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Brain Stem•Connects to _____ cord
•Reptilian brain
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Medulla ________• Involuntary functions–Breathing, _______, heart rate, coughing
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Thalamus•Sensory ______•______ is only ________
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___________•Hunger, thirst, fatigue, anger, temperature
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Brain Function•Cerebral cortex–Locations of specifics
–Wilder Penfield
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Brain Waves•Electroencephalogram (EEG)
•Weak ______ signals
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Sleep•Lowest level of brain activity
•Brain needs 5-9 hours, body-3 hours
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Memory•Long-term/short term
•_____ stick best•More ______ better
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Motor Division a part of the ________ NS•_______ nervous system
•________nervous system (smooth muscle control)
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Reflexes•______ arch -sensor, motor, effector muscles work w/out brain
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Sensory Division (preview page)
•Sight•_______•Smell•_______•Touch
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Vision
•Light image sensing
•_ layers in eyes
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Outer layer•______- whites- maintains shape & attatches muscle
•______ -light entry
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Middle layer•Anterior chamber–________ humor
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Middle layer• Iris- gives eye _____–Holds blood vessels
–Regulates____ size
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Middle layer•Pupil- black ______ for light entry
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Middle layer•Lens- ______ behind pupil bends light for focus
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Middle layer•______ chamber- filled with vitreous humor(Liquid)
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Inner Layer•______- with ____________ makes images
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Inner Layer•Cones- ______•_____- b&w
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Hearing
•_________•Sense
Pitch & volume
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•_______ (hammer)
•______(anvil)
•______(stirrup)
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•_______ moves sound to the auditory nerve
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Balance Semicircular Canal•____________ stones for balance
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Smell•_________ are cause
•Not much is known about it
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Taste•Taste buds- 4 types–_____, salty, _____, bitter
•Related to smell