The blood comes in through the superior Vena Cava or the inferior Vena Cava or the coronary sinus. All three veins empty into the right atrium. The blood then goes through the tricuspid valve and enters the right ventricle. The deoxygenated blood travels through the pulmonary valve to the pulmonary trunk and right and left pulmonary arteries. At the lungs they drop off the Carbon dioxide and collect the oxygen in the lungs. The newly oxygenated blood travels through the pulmonary veins to the left atrium. Then through the bicuspid valve and into the left ventricle. It then travels through the aortic valve to the aorta, which takes the blood out to the body to deliver oxygen. Part of the aorta branches off to the coronary arteries that deliver oxygen to the heart muscle. The coronary vein takes the waste products away from the heart muscle and lead to the coronary sinus, where the blood flow starts over.
Go here to see the blood flow video!
https://www.youtube.com/watch?v=qyYbFQ2OTZ4
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