do you know who were our first American teachers?
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However, lub is the first sound which is fairly loud and is due to the closure of the atrioventricular valves, whereas the dup is the second sound which is softer and is due to the closure of the aortic and pulmonary valves. The lub corresponds with ventricular systole whereas the dup with atrial systole.
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thomasites are the first teachers of America
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