Question

Heart and Circulatory System

How does blood circulate into and out of the heart?

A Answers (2)

  • AMehmet Oz, MD, Cardiology, answered
    Human Heart
    Blood from the body enters the heart through the upper right chamber and flows into the lower right chamber, which pumps it to the lungs. It flows back into the upper left chamber and then the lower right chamber, which pumps it back into the body. This animation shows you how this happens.


  • Blood enters the heart through veins called the superior and inferior vena cava into the right atrium. The blood passes through the tricuspid valve into the right ventricle, where it is pushed past the pulmonary valves into the pulmonary arteries to the lungs. The blood then comes back to the heart via the pulmonary veins into the left atrium. The blood then passes though the bicuspid valve into the left ventricle, where it is pushed though the aortic valves into the aorta, which carries it to the rest of the body. (This answer provided for NATA by the University of Montana Athletic Training Education Program.)
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Do the right and left sides of the heart have different functions?