Hi Tim,

Anatomy of an organ or of a system means the structure.

In the case of the heart, it has four chambers (left and right ventricles, left and right atria). The heart also has valves, to prevent backflow of blood - mitral and tricuspid valves between atria and ventricles prevent backflow into the atria when the pressure into the ventricles increases; pulmonary and aortic valves prevent back... more

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