The heart's top and bottom chambers are separated by valves that prevent backflow of blood.

Name: The heart's top and bottom chambers are separated by valves that prevent backflow of blood.
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This statement is true. The heart has four valves - the mitral valve, tricuspid valve, pulmonary valve, and aortic valve - that separate the top chambers (atria) from the bottom chambers (ventricles) and prevent backflow of blood.

The Heart's Top and Bottom Chambers Are Separated by Valves