1. Primary functions of the heart: Answer pump oxygenated blood to the tissuesconduction system 2. Four chambers of the heart: Answer right atrium, right ventricle, left atrium, left ventricle 3. Three layers of the heart: Answer endocardium: inner (protection)myocardium: middle (pumping) epicardium: outer (covers valves and tendonae) 4. Atrioventricular valves: Answer Valveslocated between the atrial and ventricular chambers on each side of the heart, prevent backflow into the atria when the ventricles are contracting. (tricuspid and mitral) closed during contraction 5. Semilunar valves: Answer pulmonary and aortic valves located between the right ventricle and the pulmonary artery and between the left ventricle and the aorta closed during relaxation 6. Pericardium: Answer Double-layered membrane surrounding the heartcontains up to 30ml of fluid between layers for lubrication