Final answer:
Valves in the heart prevent backflow of blood by ensuring unidirectional flow. Tricuspid, pulmonary, mitral, and aortic valves are the main valves involved.
Explanation:
Valves in the heart play a crucial role in preventing the backflow of blood as they open and close in one direction only, ensuring unidirectional flow through the heart. The four main valves of the heart are the tricuspid valve, pulmonary valve, mitral valve, and aortic valve.
Learn more about function of heart valves in preventing backflow of blood as part of the circulatory system here:
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