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Animation: The Human Heart and Circulation

by Pearson
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>> As mammals, humans have a four-chambered heart and two essentially separate circulatory loops. One serves the lungs-- pulmonary circulation. The other serves the body-- systemic circulation. Blood that is loaded with oxygen is carried from the lungs to the left atrium, then to the left ventricle to be dispersed to the tissues of the body. Blood depleted of its oxygen is returned to the heart through the venae cavae and then to the right ventricle, where it's sent back to the lungs to be oxygenated again.
>> As mammals, humans have a four-chambered heart and two essentially separate circulatory loops. One serves the lungs-- pulmonary circulation. The other serves the body-- systemic circulation. Blood that is loaded with oxygen is carried from the lungs to the left atrium, then to the left ventricle to be dispersed to the tissues of the body. Blood depleted of its oxygen is returned to the heart through the venae cavae and then to the right ventricle, where it's sent back to the lungs to be oxygenated again.