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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.
Left atrium: one of four chambers of the heart; pumps oxygenated blood from the lungs in to the left ventricle. Left ventricle: one of four chambers of the heart; pumps oxygenated blood out to the body. Lower vena cava: major vein that carries oxygen-poor blood from lower body to right atrium.Pacemaker: area of specialized nerve tissue that sets the pace of cardiac muscle contractions. Plasma: fluid that makes up more than half of bloodstream; contains water, nutrients, vitamins, hormones, etc.ower vena cava: major vein that carries oxygen-poor blood from lower body to right atrium. Pacemaker: area of specialized nerve tissue that sets the pace of cardiac muscle contractions. Plasma: fluid that makes up more than half of bloodstream; contains water, nutrients, vitamins, hormones, etc.