Final answer:
Blood flows through the heart starting at the right atrium, moving to the right ventricle, being pumped to the lungs, returning to the left atrium, and finally being sent out from the left ventricle to the body.
Step-by-step explanation:
The path through which blood flows in the heart begins when deoxygenated blood enters the right atrium through the superior and inferior vena cava. The right atrium contracts, pushing the blood into the right ventricle. From there, the right ventricle pumps the blood to the lungs via the pulmonary arteries for oxygenation. Once oxygenated, blood flows back to the heart, specifically into the left atrium, via the pulmonary veins.
The left atrium contracts, sending blood down into the left ventricle. The powerful left ventricle then contracts, ejecting the oxygenated blood throughout the body through the aorta. This efficient circulation is maintained by heart valves ensuring unidirectional flow and preventing backflow.