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. And we also have our semi lunar valves which connect the ventricle to our blood vessels. So let's discuss these four types of valves. So let's take a look at the following diagram.