Now, the final concept that I'd like to briefly discuss in regards to our cardiac muscle cell is the action potential and what the action potentially actually looks like compared to the action potential of our neuron. So basically, this is what the graph of the cardiac muscles action potential looks like. And notice that we have this long region known as the plateau phase that we actually don't find in the action potential of a neuron. So during the generation of an action potential inside a cardiac muscle cell, we have this extended period of depolarization that is caused by the presence of voltage gated calcium channels inside the membrane of the cell. So the membrane of the cell doesn't only contain sodium and potassium voltage gated channels, it also contains calcium voltage gated channels. So let's see what happens.