3.12

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Author:
efrain12
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249347
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3.12
Updated:
2013-11-27 10:35:24
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AnP
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synapses, NTs, cicruitry
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  1. What is the purpose of the nervous system? (2)
    -communication

    -regulation
  2. Do we have direct connectiong between control and target organ?
    no, we have multiple neurons that synapse AP all along
  3. broad descripton of AP
    -communcation in form of ion flow
  4. where does continuous conduciton occur?
    unmyelinated cells
  5. where are the voltage gated channels located on unmyelinated cells?
    all along the length of membrane
  6. broad description of myelin (2)
    -lipid coating on enrve axons

    -insulator
  7. What type of conduction occurs for myelinated nerves?
    saltatory conduction
  8. What are the nodes of ranvier ?
    -areas of no myelin
  9. what do nodes of ranvier contain?
    • voltage gated channels
    • *are only found here
  10. where are APs generated at in saltatory conduction?
    • at the nodes of ranvier
    • *they regeenerate at each of the nodes
  11. Where do graded potentals start?
    dendrites
  12. where do AP start?
    axon hillock
  13. where do AP travel through/
    axon
  14. what is a synpase?
    • junction between nerve and effector cell
    • *permits and preserves communication
  15. what is the synapse called in skeletal muscles?
    neuromuscular junction
  16. what is a presynaptic neuron?
    submits action potential to the synapse
  17. what is the postsynaptic neuron?
    receives action potential from synapse
  18. what are the 4 types of anatomical arrangements?
    • - axo-dendritic synapse
    • -axo-axonal synapse
    • -dendro-dendritic synapse
    • -dendro-somatic synapse
  19. description of axo-dendritic synapse
    -most common

  20. what is axo-axonal synapse
  21. description of dendro-dendritic synapse?
  22. description of dendro-somatic synapse
  23. What structure can modify communcation between neurons?
    surrounding glial cells, Astrocytes
  24. How do astrocytes modify communication between neurons? (3)
    • -absorb K ions from neurons
    • *so there wont be too many out on the extracell space

    -recapture and recycle NTs

    • -connected to each other by gap junctions
    • *communicate by calcium
  25. what are the 2 types of functional arrangmenets of synapse?
    -electrical \

    -chemical
  26. what is electrical synapse?
    • they are gap junctions (connexons) that are used to communicate between cells
    • *ion flow from one cell to another
    • **the pre and post membrane are fused by the gap jucntions
  27. is there physical contact between cells in chemical synapse?
    no
  28. is there ion flow between cells in chemical synapse?
    no
  29. in chemical synapses, what is used to interact with receptors?
    NTs
  30. in chemical synapses, what doesthe membrane of terminal bouton in pre synaptic cell contain?
    -calcum voltage gated channels
  31. in chemical synapses, what happens when AP arrives at the terminal bouton?
    the calcium voltage gated channels open, allowing calcium to flow in
  32. in chemical synapses, what does the calcium flowing into the terminal bouton cause?
    synaptic vesicles to migrate and fuse with the membrane to release NTs into synaptic cleft
  33. in chemical synapses, when NTs are relased what do they do?
    bind with receptors in post-synaptic neuron
  34. in chemical synapses, after the NTs bind with receptors, what happens?
    graded potential
  35. in chemical synapses, after the graded potential is initiated, what event can occur ?
    AP
  36. Why do we degrade or remove the NTs from a cell?
    to prevent inappropriate graded/action potential initiation
  37. what are the 3 mechanisms for removal of NTs?
    -pre-synaptic neuron reuptake

    -uptake by surrounding glial cells

    -enzymatic degradation and diffusion of components
  38. Where can acetylcholine be found? (4)
    -skeletal neuromuscular junction

    -cerebral cortex

    -brainstem

    • -hippocampus
    • *involved in memory
  39. what are the 3 NTs that are in the group of catecholamines that derive from biogenic amines
    -dopamine

    -norepinephrine

    -epinephrine
  40. what is dopamine involved in? (2)
    -coordination of body movements

    • -feel good
    • *assocaited with love
  41. In what disease is dopamine deficient in?
    parkinsons
  42. in what disease is dopamine in excess?
    schizo
  43. for what functions is norepinephrine involved in? (4)
    -sleep/wake

    -attention

    -feeding

    • -feel good
    • *alertness
  44. What fucntions is epinephrine involved in?
    -sleep/wake

    -attention

    -feeding

    -feel good

    ****SAME AS NOREPINEPHRINE
  45. which are the 2 NTs that are from the Indolamines deriving from biogenic amines?
    -serotonin

    -histamine
  46. what is serotonin involved in? (3)
    -sleep/wake

    -appetite

    • -mood regulation
    • *deficient in depression
  47. what is histmaine involved in? (3)
    -wakefulness

    -appetite

    -learning and memory
  48. IN general what do biogenic amines do? (2)
    -regulate bio clock

    -mood/behavior
  49. How does LSD cause hallucinations?
    binds to biogenic amine receptors
  50. what are the 3 amino acids that participate in synapse?
    -GABA

    -glycine

    -glutamate
  51. what fucntion does GABA do?
    inhibit
  52. what fucntions does glycine do?
    inhibit
  53. what function does glutamate do?
    excitatory
  54. which 2 peptides are involved in synapse?
    -substance P

    -endorphins
  55. what is substance P involved in?
    -important mediator of pain transmission in PNS
  56. what are endorphins involved in? (2)
    -natural opiates

    -block pain by inhibiting substance P

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