If the ECF around a nerve cell is replaced with an isotonic saline solution that contains potassium ions and other solutes at concentrations very close to the ECF concentrations of a normal cell,the result is
A)no resting membrane potential.
B)hyperpolarized membrane.
C)depolarized membrane.
D)a resting membrane potential close to its normal value.
E)None of these choices is correct.

Question

Quizplus · Accepted Answer

Since the solution being used has concentrations of solutes that are similar to those found in a normal cell's ECF, and since potassium ions are also present, the resting membrane potential should be close to its normal value. This is because the resting membrane potential is largely determined by the concentration gradients of ions, particularly potassium, across the cell membrane. Therefore, the most likely outcome of replacing the ECF with this solution is that the nerve cell membrane will have a resting potential close to its normal value.

If the ECF Around a Nerve Cell Is Replaced with an Isotonic