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