Resting and Action Potential;

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Author:
ninabolong
ID:
199607
Filename:
Resting and Action Potential;
Updated:
2013-02-11 00:26:34
Tags:
Resting Potential
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Description:
Resting Potential
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  1. major cation inside
    potassium
  2. major cation outside
    sodium
  3. excess of positive outside and negative inside the membrane; gives rise to an electrical potential difference which ranges from about 60-70 mV
    resting membrane potential
  4. type of channel that opens when the membrane potential changes beyond threshold value
    voltage- gated ion channel
  5. opens when bound by specific agonist, initiates depolarisation or hyperpolarization of the plasma membrane
    ligand gated
  6. RMP of nerve cells
    -70mV
  7. membrane becomes permeable to sodium ions overshoot beyond zero and becomes somewhat positive
    depolarization
  8. sodium ion channels close, potassium open
    repolarization
  9. membrane potential becomes more negative than the original resting potential 
    after polarisation
  10. travel away from the stimulus; all or nothing principle
    action potential
  11. fast channels that is responsible for the spike portion of action potential 
    voltage activated sodium channels
  12. excessive flow of potassium; carries tremendous numbers of (+) charges to the outside creating more (-) inside 
    hyperpolarization
  13. jump of action potential; new stimulus can't be elicited because sodium channels are inactivated
    refractory period

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