It's very important that the heart actually creates a unidirectional motion of blood. And to ensure that the blood doesn't actually flow backwards inside the heart we have a system of four different valves found inside our heart. So the heart must be able to pump blood in a unidirectional fashion. And in order to prevent our backflow of blood inside our heart the heart uses our four different valves. Now, actually, it's two sets of different valves. So we have the atrial ventricular valves that connect the atrium and our ventricle.