Physiology 3

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Author:
kwoolley
ID:
60096
Filename:
Physiology 3
Updated:
2011-01-16 14:56:49
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Physiology shoreline
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Description:
3rd lecture from moffat
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  1. Leaky channels
    more for Na then K these gates are always open.
  2. Gated channels
    needs a stimulus to open them up,
  3. Voltage gate
    opens up with the right membrane potential ions change
  4. Chemical gated
    Chemicals like neurotransmittor and or hormones
  5. mechanical gated
    streching or deforming the shape of the cell to let stuff in. Ex. pressure such as touch (sensory).
  6. # of channels
    3 Na K or Ca
  7. Calcium
    when it attaches to a vesicle it lets it do a exocytosis of the neurotransmitter. When the voltage gates are open it makes the cell more permability.
  8. A current
    whenever you are transfering a ion across the membrane you are generating a current across the cell. doesnt matter what ion as long as they going across the membrane. the current causes a change in the membrane potential
  9. excitatory transmitter
    excites the post synaptic membrane. postive charges coming in like ACh. sodium moves in potassium moves out because of the ACh exciting it causing membrane potential to be more positive.The postive area moves down because of diffusion it moves down but fades after a while but if theres another puff it adds to that charge.
  10. inhibitory transmitter
    GABA it inhibits so K moves in increase of Cl- making the membrane potential negative making it more likely to have action potential. you would want this when you sleep so that you dont move around.
  11. temporal summation
    1st stimulus then needs another stimulous to get enough action potential. they are trying to reach the axon hillock (initiation zone) because the first one just isnt enough
  12. spatial summation
    2 or more axons SIMULTANIOUSLY releasing the stimulous so that its a big bang making it reach the axon hillock and create action potential
  13. degradation of neurotransmitter
    enzymes break down the neurotransmitter to stop the reaction, they always end with -ase
  14. reuptake
    ..of neurotransmitter so that it stops the reaction. and it does endocytosis and gets sucked up back into the cell ex. epinephrine seratonin dopamine
  15. monoamino oxidase inhibitors (maoi's)
    inhibits the enzymes from breaking down the neurotransmitter so its more likely to be absorbed. Ex. prozac Seratonin reuptake inhibitor SSRI is a specific inhibitor so there is less side affects then a general one.
  16. presynaptic facilitation
    serotonin is release helping make more Ca gates open up so more Ca can come in and more neurotransmitter is released more exocytosis.
  17. presynaptic inhibition
    GABA is released into the presynaptic structure which decrease the amount of neurotransmitter that is released because less Ca can come in the gaba blocks the voltage gated Ca gates.
  18. action potential
    a brief transiant change in the membrane potential in response to a stimulous.
  19. a stimulous
    a stimoulous causes a change in the permability of a membrane Ex. chemical mechanical, heat light or electrical

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