Atria
Medical term · A
The upper chambers of the heart. There are two of these—the right atrium and the left atrium.
Related terms
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Right atriumThe right upper chamber of the heart; it receives partially deoxygenated blood as it returns from the body's tissues and moves it into the right ventricle for distribution to the…
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Left atriumThe left upper chamber of the heart.
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AtriumOne of the two upper chambers of the heart.
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Atrioventricular nodeAlso known as the AV node. A major part of the electrical system in the heart that acts as a gateway between the atria and the ventricles. An electrical signal generated by the…