Assume ions A and B are both positively charged. Extracellular [A] is 10X intracellular [A]. The neuronal membrane is permeable only to ion B. After B is added to the extracellular solution, which of the following would you expect to be true?

Question

Quizplus · Accepted Answer

Given that the neuronal membrane is only permeable to ion B, B would move across the membrane until its equilibrium potential is reached, not necessarily until the concentrations are equal on both sides. This movement is driven by the electrochemical gradient specific to ion B, without directly affecting the movement of ion A, since the membrane is impermeable to A.

Assume Ions a and B Are Both Positively Charged