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Circulatory System Parts of the Heart Study Guide Circulatory System Heart Atrium Right Atrium Left Atrium Ventricles Right Ventricle Left Ventricle Valve Pacemaker Septum Parts of the heart Carries needed substances to cells Carries waste products away from cells It helps to fight disease. Also known as cardiovascular system A hollow muscular organ that pumps blood throughout the body Two upper collecting chambers of the heart Receives blood from the body. The blood is low in oxygen and high in waste Receives oxygen-rich blood from the lungs Two lower pumping chambers of the heart Pumps blood with low-oxygen to the lungs Pumps blood with high oxygen to all parts of the body A flap of tissue that prevents blood from flowing backward Located in the right atrium and sends out signals that make the heart muscle When does it signal the heart to speed up? Thick muscular wall the separates the right and left sides of the heart Be able to label the parts of the heart