 The human heart and the cardiovascular system. The heart and the blood vessels work together to maintain a constant flow of blood through the body. The heart, located between the lungs, is pear-shaped and about the size of a fist. It functions as a two-sided pump. The right side pumps blood from the body to the lungs. Simultaneously, the left side pumps blood from the lungs to the body. Each side of the heart has two chambers, an upper atrium and a lower ventricle. In this learning activity, you will identify the parts of the cardiovascular system and examine blood flow. Let's highlight parts of the circulatory system. Trachea, arch of aorta, or aortic arch. Diaphram, let's take a closer look at the heart. Let's highlight each term of the human heart. Brachiosephalic artery, left common carotid artery, left subclavian artery, arch of aorta or aortic arch, left pulmonary artery, left atrium, left pulmonary veins. Right cardiac vein, branches of left coronary artery and cardiac vein. Left ventricle, apex, right ventricle, right coronary artery and cardiac vein. Right atrium, branches of right pulmonary veins. Right pulmonary artery, ascending aorta, superior vena cava. Let's highlight parts of the heart's interior. Aorta, left pulmonary artery, left pulmonary veins, left atrium. Bicuspid valve, aortic semilunar valve, cordae tendinier, left ventricle, right ventricle, interventricular septum, tricuspid valve, right atrium, pulmonary semilunar valve. Superior vena cava, blood flow. Here we view pulmonary circulation. Now let's view systemic circulation. You have completed this activity, the human heart and the cardiovascular system.