They measure an athlete's performance in that area being tested. This is done to compare to past performance evaluation tests and to measure if the athlete is getting better or worse. It also determines if the athlete should stop or keep doing his/her sport.
About 30% to 65% of people with thymomas also have myasthenia gravis (MG)
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The human heart consist of four valves. One of these is the mitral valve which connects the left atrium to the left ventricle. During diastole, it opens to allow blood from the left atrium to flow to the left ventricle. But during ventricular systole, it closes to prevent backflow of blood back to the left atrium.