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Kaplan Qbank USMLE



Author6 Posts
  #1

The resting membrane potenital for an isolated muscle cell is -70mV. Equiblirium potential for important ions are given below:
  • ENa=+60mV
  • EK=-80mV
  • ECl=-90mV
  • ECa=+125mV
  • EMg=0mV

Which of the following ions would flow out of the cell once specific ion channels are open?
  1. Sodium and Calcium
  2. Magnesium and Chloride
  3. Potassium and Chloride
  4. Magnesium and Calcium
  5. Potassium only


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  #2

1

  #3

5

  #4

Potassium only


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  #5

5 potassium

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  #6

5 is correct.


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