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The heart is a complex organ essential for pumping blood throughout the body. It consists of four chambers: the right atrium and ventricle, and the left atrium and ventricle, which work together in a coordinated manner. Blood flow through the heart starts when deoxygenated blood enters the right atrium via the vena cava. The SA node, known as the heart's natural pacemaker, triggers the contraction of the atria, pushing blood through the tricuspid valve into the right ventricle. Upon contraction of the right ventricle, blood is pushed through the pulmonary valve into the pulmonary artery, leading to the lungs where it gets oxygenated. Oxygen-rich blood then returns to the heart via the pulmonary veins, entering the left atrium. The process repeats as the SA node fires again, causing the atria to contract and move blood through the mitral valve into the left ventricle. From here, the left ventricle contracts, sending oxygenated blood through the aortic valve into the aorta, supplying the body with essential nutrients. Understanding these processes is crucial for anyone studying premed or anatomy, as it lays the foundation for knowledge about cardiovascular diseases and treatments. Diagrams illustrating this blood flow can enhance comprehension and serve as useful study aids.