Four Chambers Divided by vertical septa to form 4 chambers Right atrium and left atrium, separated by interatrial septum Right ventricle and left ventricle, separated by Right Atrium Left atrium interventricularseptum Supenor vena ca Right atrium and right ventricle is guarded by a Ascending aorta valve, the tricuspid valve,三尖瓣 Pulmonary trunk Left atrium and left ventricle is guarded by puimonary vean Pulmonary v Aortic v mitral va|ve二尖瓣 Mitral v Deoxygenated blood returns to right atrium then to right ventricle which is pumped to the Tricuspid V lungs via pulmonary trunk guarded by Rightventricular wall pulmonary valve肺动脉瓣 Oxygenated blood from the lungs enters the vena cava left atrium then to left ventricle Right ventricle Left ventricle This blood is pumped through aorta guarded by aortic valve主动脉瓣Four Chambers • Divided by vertical septa to form 4 chambers • Right atrium and left atrium, separated by interatrial septum • Right ventricle and left ventricle, separated by interventricular septum • Right atrium and right ventricle is guarded by a valve, the tricuspid valve, 三尖瓣 • Left atrium and left ventricle is guarded by mitral valve 二尖瓣 • Deoxygenated blood returns to right atrium then to right ventricle which is pumped to the lungs via pulmonary trunk, guarded by pulmonary valve 肺动脉瓣 • Oxygenated blood from the lungs enters the left atrium, then to left ventricle • This blood is pumped through aorta guarded by aortic valve 主动脉瓣 Right Atrium Right ventricle Left atrium Left ventricle Tricuspid v Mitral v Pulmonary v Aortic v