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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 diameter of the aorta gradually decreases as blood flow is directed to tissue and organs, flowing through arteries then the smaller arterioles then the capillary beds at the target organ, tissue, etc. Here the oxygen is liberated to the tissue and the blood picks up the resulting CO2. just now. Report Abuse. Oxygenated blood flows from the lungs to the left atrium contractions (heart muscle) cause the blood to leave the atrium and enter the left ventricle. Further contraction causes the blood to leave the atrium and enter the aorta.