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atrium


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n. ( pl.atria) 1. either of the two upper chambers of the heart. Their muscular walls are thinner than those of the ventricles; the left atrium receives oxygenated blood from the lungs via the pulmonary vein; the right atrium receives deoxygenated blood from the venae cavae. See also auricle. 2. any of various anatomical chambers into which one or more cavities open. —atrialadj.

1. either of the two upper chambers of the heart. Their muscular walls are thinner than those of the ventricles; the left atrium receives oxygenated blood from the lungs via the pulmonary vein; the right atrium receives deoxygenated blood from the venae cavae. See also auricle. 2. any of various anatomical chambers into which one or more cavities open.

Subjects: Medicine and Health — Science and Mathematics.


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