And what that does is it allows the creation of a continuous and a forceful contraction of the entire heart. And that allows the heart to pump all the blood throughout the cardiovascular system. Now, another example of these intercellular communications via gap junctions is in the muscle cells of the uterus. So if a woman is about to give birth, so that uterus must contract. And it's these gap junctions that allows the contraction of that uterus muscle. Now, another area that uses gap junctions to basically communicate between nearby cells is inside the brain.