A&P.nervous.action
Help!
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| resting membrane potential | plasma membrane creates slight difference between charge inside & outside the cell
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| what is potential difference in skeletal muscle cells? | -70 to -90 mV
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| what is the purpose of the sodium potassium pump? | moves NA+ and K+ through the plasma membrane AGAINST their concentration gradients
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| why is cell negative? | because it produces negatively charged proteins
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| the resting membrane potential is an equilibrium | established when K+ diffuses out of the cell - then becomes equal to the tendency of K+ to move back into the cell, because it is attracted to negatively charge proteins inside the cell
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| depolarizing | closer to zero - sodium is entering into the cell
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| repolarization | drops it to -70 - potassium is leaving the cell
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| sodium-potassium pump | flips
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| full action potential | as we depoarize, sodim enters cell
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| threshold | must cross threshold, sodium chaneels open, floods in, creates charge - makes cell more positive, sodium is in cell - crested -
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| repolarization | potassium starts to leave
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| refractory period | balances out - absolute & relative
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| refractory period |
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| Potassium & sodium are actively pumped out of the cell & then leak back inPotassium passes easily; sodium and chloride have a more difficult timeProteins are negative-cannot pass membrane IMBALANCE in voltage is a “potential” difference – ther
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Created by:
walterina4327