Loren bio 7

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Loren bio 7
2012-05-18 13:07:50
Loren bio

Loren bio 7 (nervous system)
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  1. What's the functional unit of the nerve?
    the neuron
  2. What's another name for the cell body?
  3. What are the three parts of a nerve cell?
    • Dendrite
    • cell body
    • Axon
  4. What cells are the axons made of?
    • glial (oligodendrocytes...CNS)
    • Schwann cell (PNS)
  5. What's the millivolts at resting potential?
    about -70mV
  6. What's more negative, the inside or outside of a nerve cell?
    the inside ( more K)
  7. How does the ATPase work? (Na/K pump)
    it takes 3 Na out for every 2 K brought in
  8. Why does Na want into the cell?
    cause of concentration difference, and charge difference
  9. When does the action potential go off?
    when the resting potential gets about to -55 mV it shoots off.
  10. Whats the rest period called?
  11. what affects the speed of a nerve impulse?
    • the size of a nerve cell (bigger faster)
    • more myelin (faster)
  12. What does S.A.M.E. stand for?
    • Sensory (afferent)
    • Motor (efferent)
  13. What's involved in the CNS
    brain and spine
  14. What's involved in the PNS (periphery)
    • somatic
    • autonomic
  15. What is the somatic nervous system?
    its the voluntary skeletal muscle use
  16. What's the autonomic nervous system?
    • Sypathetic: fight or flight
    • Parasympathetic: rest and relax
  17. What effect does the drug curare have on nerves?
    it blocks post synaptic receptors (paralysis)
  18. What effect does Botulism toxin have?
    it blocks presynaptic acetycholine (paralysis)
  19. What effect does Anti-cholinesterases have?
    it blocks the "breakdown" of neurotransmitter acetylcholine (muscle goes crazy and can't stop)
  20. What portion of the brain is gray?
    outer portion
  21. what portion of the brain is white?
    the inner portion
  22. Where is the telenchephalon/diencephalon located?
    in the forebrain
  23. What is in the forebrain?
    • telenchepelon/diencephalon
    • cerebral cortex
    • olfactory bulb
    • Thalamus
    • hypothalamus
  24. What does the cerebral cortex do?
    • sensory
    • motor
    • memory and ideas
  25. Diencephalon
    What does the thalamus do?
    relays stuff to spinal cord
  26. diencephalon
    What does the hypo thalamus do?
    hunger, thirst, sex, water balance, blood pressure, temp regulator
  27. Whats in the midbrain?
    the mesencephalon (visual, audio, motor)
  28. What's the brainstem?
    • cerebellum
    • pons
    • medulla
  29. What's in the hindbrain? three things
    • cerebellum
    • pons
    • medulla (medulla oblangata)
  30. What does the cerebellum do?
    motor skills (balance, hand eye coordination)
  31. What does the pons do?
    middle man from cortex to cerebullum
  32. What's the medulla oblongata do?
    regulates breathing, heart rate, stomach
  33. What's the white part of the eye?
  34. What does the choroid do?
    gets blood to the retina
  35. Where are the photoreceptors located?
    in the retina
  36. Where does the lens focus light to?
    the retina
  37. what do cones see best
    color, intense light
  38. What do rods see best?
    low intensity light (night)
  39. What are the three pigments in cones?
    red, green, blue
  40. What's the one pigment in Rods?
  41. What is myopia? (it's my problem)
    nearsighted...can see close
  42. what's hyperopia?
  43. What's glaucoma?
    pressure in the eye. (aqueous humor)
  44. What are the three ear bones (ossicles) called?
    malleus, incus, stapes
  45. Where are the three bones located?
    middle ear
  46. What goes on in the inner ear?
    • the vestibular apparatus helps with balance
    • the cochlea (vibrations twitch the hair cells in the basilar membrane.
  47. Describe protozoa NS
    no organized NS ....but they respond to stimuli
  48. Describe cnidaria NS
    • simple nerve net
    • clusters cells and pathways....help coordinate swimming
  49. Describe annelida NS
    earthworms have a primitive CNS
  50. Describe Arthropod NS
    more specialized sense organs. similar primitive like the worm