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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.
The right atrium is the upper chamber of the right side of the heart. The blood that is returned to the right atrium is deoxygenated (poor in oxygen) and passed into the right ventricle to be pumped through the pulmonary artery to the lungs for re-oxygenation and removal of carbon dioxide.