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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.
Right atrium. The right atrium is one of the four chambers of the heart. The heart is comprised of two atria and two ventricles. Blood enters the heart through the two atria and exits through the two ventricles. Deoxygenated blood enters the right atrium through the inferior and superior vena cava. The right side of the heart then pumps this deoxygenated blood into the pulmonary veins around the lungs.