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Best Answer: An enlarged left atrium means simply that the atrium that pumps blood in the ventricle that pumps blood to the rest of the body is larger than it should be, the seriousness depends on the size of the enlargement, a small enlargement usually won't pose any noticable problems, however, a larger deviation from normal size can lead to problems ranging from electrical dissarray such as atrial fibrillation to stroke, due to blood pooling in the atrium.
1 The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle. 2  The left ventricle (the strongest chamber) pumps oxygen-rich blood to the rest of the body. 3  The left ventricleâs vigorous contractions create our blood pressure. 2014 WebMD, LLC. All rights reserved. The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.