Heart valves
There are four heart valves. All are one-way valves. Blood entering the heart first passes through the tricuspid valve and then the pulmonary valve. After returning from the lungs, the blood passes through the mitral (bicuspid) valve and exits via the aortic valve.
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- Heart ventricle
One of the two lower chambers of the heart. The right ventricle receives blood from the right atrium and pumps it into the lungs via the pulmonary artery, and the left ventricle receives blood from the left atrium and pumps it into the circulation system via the aorta.
- Heart, artificial
A human-made heart that is used to replace a diseased or malfunctioning heart when a donor organ is not available.
- Heart, left
The left atrium and left ventricle.
- Heart, Lung, and Blood Institute, National
One of the National Institutes of Health in the U.S., the NHLBI’s mission is to “provide leadership for a national research program in diseases of the heart, blood vessels, lungs, and blood and in transfusion medicine through support of innovative basic, clinical, and population-based and health education research.”
- Heart, right
The right atrium and right ventricle.