Okay, so we're looking at the internal anatomy here at the heart. We'll follow it just like we follow blood flow through the heart so that begins here in the right atrium. Okay, so in the right atrium we've got the brush blood from the body coming in, typically on oxygenated. You can see the fossa ovalus here. It's a remnant from when you're in utero. Now it's just kind of an indenture there in the right atrium. The atrial themselves are made up of this particular type of muscle called the big tinate muscles. They help constrict the arteries or the atrium. Sorry. The atrium, so we have left and right atrium here. They're separated by the inter atrial septum. So that's kind of the separation between the two atrium themselves. Okay, so now we'll flow downward through this valve. This is our tricuspid valve here. Okay, we can see the tricuspid valve has these kind of tindrical connection points there. Cordaic tin and day. Cordaic tin and day. Okay, these connect to papillary muscles here, which help open and close the valve. So now we're inside of my right ventricle. So just like the big tinate muscles here in the atrium, the ventricles also have their own, the triculae carne. So then blood will flow from here up my pulmonary semi-linear valve, the pulmonary vein, our pulmonary arteries, coming into my pulmonary veins into my left atrium down through the mitral or bicuspid valve. So we can still see those same similarities, papillary muscles, etc. And eventually out of the left ventricle coming up through my aortic semi-linear valve, which is here and again out the aorta.