Now, although it is controlled by the autonomic nervous system, certain cardiac muscle cells actually exhibit something called myogenic activity. And myogenic activity simply means that certain cardiac muscle cells inside the heart can actually initiate a contraction without a stimulus from the nervous system. And we'll talk more about that when we're going to discuss the cardiovascular system. 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.