6. Although facilitated diffusion is clearly happening, the indicated ion concentrations are not changing. That is because this image is actually missing a very important protein called the
sodium-potassium pump. Think about what you know about the concentration gradients.
(Remember: ions typically flow from areas of high concentration to areas of low
concentration, but it can go in the other direction, as well.)
a. What must this pump be doing to maintain the concentration gradient?
I.
b. What kind of transport is it doing - active or passive?
C. Which direction must each ion be moving through the pump?