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The Circulatory Systm 4 Chambers • The Human heart is a 4 Chambered heart • It consists of two atriums and two ventricles • Atriums receive blood while Ventricles pump it out to some part of the body • Arteries carry blood away from the heart while veins carry blood too the heart Right Atrium • The right Atrium receives blood from the whole body except the lungs. • The Superior and Inferior Vena Cava carry the deoxygenated blood to this chamber. • The blood is then moved to the Right Ventricle. Right Ventricle • Receives deoxygenated blood from the Right Atrium. • Then it pumps this blood away from the heart and to the lungs. At the lung the blood will take up oxygen. • Blood is carried away from the Right Ventricle by the Pulmonary Artery. Lungs • When blood is carried to the lungs by the Pulmonary Artery it goes through narrowing passage. • By the time the Blood gets to where it is oxygenated in the lungs the passage is so small only one blood cell at a time can fit through it. • It is then oxygenated and carried back to the heart via the pulmonary veins. Left Atrium • The left Atrium receives blood from only the lungs. • The Pulmonary Veins carry the blood to the Left Atrium • This blood is oxygenated. • The blood is then moved to the Left Ventricle. Left Ventricle • Receives oxygenated blood from the Left Atrium. • Then it pumps this blood away from the heart and to the whole Body except the lungs. • Blood is carried away from the Left Ventricle by the Aorta.