Nervous System Ch 50

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1 Nervous System Ch 50 The brain & friends

description

Nervous System Ch 50. The brain & friends. Purpose. Communication Relays _______ ______ changes inside and out. Basic Cell. ______ Sends signals called impulses. 3 types of neurons. ______: eye to brain Motor: Brain-spine-muscles ________: Connects the other Two. Neuron Parts. - PowerPoint PPT Presentation

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