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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 atrium receives deoxygenated blood from the blood vessels (veins) that drain the various organs of the body. 2  The left atrium receives oxygenated blood from the lungs and skin (which also serves as a gas exchange organ in most amphibians). 3  Both atria empty into the single ventricle. Contraction of the ventricle forces the blood into the capillary networks of the gills where gas exchange occurs. 2  The blood then passes on to the capillary networks that supply the rest of the body where exchanges with the tissues occur. 3  Then the blood returns to the atrium.