Figure 106b

These series of illustrations describe the flow of un-oxygenated blood from the superior vena cava and inferior vena cava into the right atrium. The blood is seen to flow the right atrium through the tricuspid valve into the right ventricle. The blood is then pumped through the right ventricular outflow tract through the pulmonary valve and on into the right and left pulmonary arteries to the lungs, where the blood will be oxygenated. The oxygenated blood will flow through the pulmonary veins into the left atrium. Subsequently it passes through the mitral valve into the left ventricle. It is then pumped through the aortic valve into the ascending aorta and on into the various arteries of the body.