General Anatomy/Cardiovascular System
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The Cardiovasular System is the human body system where the heart pumps blood through the blood vessels all throughout the body. In the heart, there are 4 chambers: Left Ventricle, Right Ventricle, Left Atrium, and the Right Atrium. The two atriums get the blood first then, it's sent down to the two ventricles to be pumped out. The heart also has 4 valves: Pulmonary Valve, Tricuspid Valve, Aortic Valve, and the Mitral Valve. The heart has 4 layers, the most inner layer is called the endothelium, the second layer is called myocardium ( the cardiac muscle), the next layer is the epicardium.