Well, there are many different examples of concentration cells. Today we're going to look at a very important biological example of a concentration cell called a neuron cell. Now, neuron cells are simply specialized concentration cells found within our nervous system, within our body that communicate with one another via changes in ion concentration. Now, these changes in ion concentration create a difference in voltage or something called a cell voltage. And this difference in voltage creates electrical signals. Now, these electrical signals travel from one cell to another, and this is how cells communicate.