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Nervous System Ch 50

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.

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Nervous System Ch 50

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  1. Nervous SystemCh 50 The brain & friends

  2. Purpose • Communication • Relays _______ • ______ changes inside and out

  3. Basic Cell • ______ • Sends signals called impulses

  4. 3 types of neurons • ______: eye to brain • Motor: Brain-spine-muscles • ________: Connects the other Two

  5. Neuron Parts • ____

  6. ______

  7. _____

  8. _____ ______

  9. Myelin _____ • Made by _______ cells • conducts impulses _____ • Increases w/ smarts • _____ substance

  10. ______ Potential • Na+ is allowed in

  11. Threshhold • Strength of a ________ to cause a response • Ex. toilet flush model

  12. Synapse • Information passage • _______ signals • _________ _________

  13. Divisions of the Nervous system • _______ NS • Brain & spinal cord • ________ NS • Everything else • ______ to CNS and Efferent

  14. Brain (preview page) • Parts • ________ • Cerebral cortex • ________ • Brain stem

  15. Cerebrum • _____ part • All _______ activity • Intelligence, learning…

  16. 4 lobes • ______ • Parietal • _______ • occipital

  17. 2 hemispheres • L&R control ______ side of body

  18. cerebral cortex • Outer layer • “____ matter”

  19. Cerebellum • ____________ • Learning a new physical activity difficult

  20. Brain Stem • Connects to _____ cord • Reptilian brain

  21. Medulla ________ • Involuntary functions • Breathing, _______, heart rate, coughing

  22. Thalamus • Sensory ______ • ______ is only ________

  23. ___________ • Hunger, thirst, fatigue, anger, temperature

  24. Brain Function • Cerebral cortex • Locations of specifics • Wilder Penfield

  25. Brain Waves • Electroencephalogram (EEG) • Weak ______ signals

  26. Sleep • Lowest level of brain activity • Brain needs 5-9 hours, body-3 hours

  27. Memory • Long-term/short term • _____ stick best • More ______ better

  28. Motor Division a part of the ________ NS • _______ nervous system • ________nervous system (smooth muscle control)

  29. Reflexes • ______ arch -sensor, motor, effector muscles work w/out brain

  30. Sensory Division (preview page) • Sight • _______ • Smell • _______ • Touch

  31. Vision • Light image sensing • _ layers in eyes

  32. Outer layer • ______- whites- maintains shape & attatches muscle • ______ -light entry

  33. Middle layer • Anterior chamber • ________ humor

  34. Middle layer • Iris- gives eye _____ • Holds blood vessels • Regulates ____ size

  35. Middle layer • Pupil- black ______ for light entry

  36. Middle layer • Lens- ______ behind pupil bends light for focus

  37. Middle layer • ______ chamber- filled with vitreous humor (Liquid)

  38. Inner Layer • ______- with ____________ makes images

  39. Inner Layer • Cones- ______ • _____- b&w

  40. Hearing • _________ • Sense Pitch & volume

  41. _______ (hammer) • ______ (anvil) • ______ (stirrup)

  42. _______ moves sound to the auditory nerve

  43. Balance Semicircular Canal • ______ ______ stones for balance

  44. Smell • _________ are cause • Not much is known about it

  45. Taste • Taste buds- 4 types • _____, salty, _____, bitter • Related to smell

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