1. 1 Nervous System Ch 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

6. Neuron Parts ____

7. ______

8. _____

9. ______

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

11. ______ Potential Na+ is allowed in

12. Threshhold Strength of a ________ to cause a response –Ex. toilet flush model

13. Synapse Information passage _______ signals –_________ _________

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

15. Brain (preview page) Parts –________ –Cerebral cortex –________ –Brain stem

16. Cerebrum _____ part –All _______ activity Intelligence, learning…

17. 4 lobes ______ Parietal _______ occipital

18. 2 hemispheres L&R control ______ side of body

19. cerebral cortex Outer layer –“____ matter”

20. Cerebellum ____________ Learning a new physical activity difficult

21. Brain Stem Connects to _____ cord Reptilian brain

22. Medulla ________ Involuntary functions –Breathing, _______, heart rate, coughing

23. Thalamus Sensory ______ ______ is only ________

24. ___________ Hunger, thirst, fatigue, anger, temperature

25. Brain Function Cerebral cortex –Locations of specifics –Wilder Penfield

26. Brain Waves Electroencephalogram (EEG) Weak ______ signals

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

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

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

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

31. Sensory Division (preview page) Sight _______ Smell _______ Touch

32. Vision Light image sensing _ layers in eyes

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

34. Middle layer Anterior chamber –________ humor

35. Middle layer Iris- gives eye _____ –Holds blood vessels –Regulates ____ size

36. Middle layer Pupil- black ______ for light entry

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

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

39. Inner Layer ______- with ____________ makes images

40. Inner Layer Cones- ______ _____- b&w

41. Hearing _________ Sense Pitch & volume

42. _______ (hammer) ______ (anvil) ______ (stirrup)

43. _______ moves sound to the auditory nerve

45. Balance Semicircular Canal ______ stones for balance

46. Smell _________ are cause Not much is known about it

47. Taste Taste buds- 4 types –_____, salty, _____, bitter Related to smell