From the body/myocardium, de-oxygenated blood flows from the superior and inferior vena cava and the coronary sinus into the right atrium. From the right atrium, the blood passes the tricuspid valve into the left ventricle, up through the pulmonary valve into the pulmonary arteries, and then finally into the lungs. In the lungs, the the blood re-oxygenates and gets rid of carbon dioxide waste in the alveoli. Once sufficient oxygen is once again incorporated in the blood, it enters back into the heart through the pulmonary veins into the left atrium. From the left atrium, blood crosses the bicuspid valve into the left ventricle and then through the aortic valve to reach the aorta arch and descending aorta, where the blood is once again pumped into the body to distribute oxygen and nutrients.
https://www.youtube.com/watch?v=MyQ2jNr3_64&feature=youtu.be
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