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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.
The blood from the lungs reenters the heart through the left atrium. The left atrium them pushes blood into the left ventricle, which in turn pumps the oxygenated blood throughout your body. Notice that blood always enters the heart through an atrium, and always leaves the heart through a ventricle.