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# Thinking Experiment: Artificial Membrane

NEURO-ZCCH41

Imagine you have built an artificial membrane with only sodium channels and potassium channels, then you place the membrane between two chambers containing water. On one side of the chamber, you put 5 mM KCl into the water; on the other side of the chamber, you put 5 mM NaCl.

Which of the following statements CORRECTLY describes the movement of ions across your artificial membrane?

A

${ K }^{ + }$ will flow until the membrane reaches the ${ E }_{ K }$.

B

${ Na }^{ + }$ will flow until the membrane reaches the ${ E }_{ Na }$.

C

${ K }^{ + }$ and ${ Na }^{ + }$ will flow in opposite directions until the concentrations of ions on two sides of the membrane are equal.

D

Neither ${ K }^{ + }$ nor ${ Na }^{ + }$ ions will flow.