please check my answers and give an clarification if I am on the wrong track! thanks
A hypothetical cell membrane is positively charged on the intracellular side and negatively charged on the extracellular side. In this cell, the concentration of ion Y- in the intracellular space is high and in the extracellular space is low.
http://s1140.photobucket.com/albums/n575/sanjanz2392/?action=view¤t=f.jpg <--LINK!!!!
3) Imagine an ion channel opens that allows Y- to flow. Will Y- flow across the membrane, through the ion channel? If so, what direction will the net electrochemical gradient(s) for Y- favor it flowing? (Assume the two gradients are of equal magnitude.)
a) Yes, it will flow from extracellular to intracellular.
b) Yes, it will flow from intracellular to extracellular.
c) No, it will not flow.
No, it will not flow because chemical gradient favors flow out and electrical gradient favors flow in. The net flow is zero?
4) What reasoning led you to your determination of which direction the ion would flow?
a) Both the chemical and electrical gradients favor movement out.
b) Both the chemical and electrical gradients favor movement in.
c) The chemical and electrical gradients balance each other out.
d) There are no gradients acting on Y-.
The chemical and electrical gradients balance each other out.
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