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atrium




human heart
Either of the two (right and left) upper chambers of the four-chambered heart. The left atrium receives oxygenated blood from the pulmonary veins; the right atrium receives deoxygenated blood from the venae cavae. The atria are comparatively thin-walled since they only pump blood down into the muscular ventricles. The term is also used for various other chambers in animals.


Related entry

   • atrial septal defect


Related categories

   • HEART TOPICS
   • ANATOMY AND PHYSIOLOGY