4 Layers of Heart WallEndocardium- smooth thin layer of cells that helps to reduce friction caused by blood that is constantly moving through chambersPericardium- A sac that fits loosely over the heartMyocardium- muscular wall constantly active and needs a generous supply of oxygen and energy from blood
7 Outer Anatomy SUPERIOR VENA CAVA AORTA PULMONARY TRUNK RIGHT ATRIUM PULMONARY VEINSLEFT ATRIUMRIGHT VENTRICLELEFT VENTRICLE
8 Valves of the Heart There are 4 valves of the heart Tricuspid valve: right side, 3 cuspsMitral valve: 2 cuspsPulmonary valve: between Right ventricle and pulmonary artery, opens as Right ventricle contracts and forces blood out to the lungsAortic valve: between the Left ventricle and the aorta , opens as Left ventricle contracts and forces blood out to the body
9 Heart valves open Heart valve closed Cusps forced apart by pressure of blood pumped by ventricleHeart valve closedPressure causes the cusps to close and seal preventing reverse blood flow
10 Bibliography The Circulatory System by Regina Avraham The Human Body by Steve Parker
Your consent to our cookies if you continue to use this website.