Q:

Given the concentration of Na+ inside the cell is about 10 mmol/L while it is 140 mmol/L in the extracellular fluid. The values for K+ are 140 mmol/L inside the cell and 4 mmol/L extracellularly

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Given the concentration of Na+ inside the cell is about 10 mmol/L while it is

140 mmol/L in the extracellular fluid. The values for K+ are 140 mmol/L inside

the cell and 4 mmol/L extracellularly. In what directions would these ions

diffuse?


  1. Na+ would diffuse into the cell while K+ would diffuse out.
  2. K+ would diffuse into the cell while Na + would diffuse out.
  3. Both Na+ and K+ would diffuse out of the cell.
  4. Both Na+ and K+ would diffuse into of the cell.

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A: Na would diffuse form 140 mmol/L to 10 – the direction of its

concentration gradient which is from outside to inside. K would diffuse from

140 mmol/L to 4, that is from inside to outside.

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