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HOME >> BIOLOGY >> DICTIONARY. In modern architecture, an atrium (plural atria) is a large open space, often several stories high and having a glazed roof and/or large windows, often situated within an office building and usually located immediately beyond... Atrium (architecture), a large open space within a building.
One of the two upper receiving chambers of the heart. The left atrium receives pulmonary venous blood (oxygenated, from the lungs) and the right atrium receives systemic venous blood (partly deoxygenated, from the rest of the body). atria pl, atrial adj. See Figure 1. Figure 1: The nervous system.