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The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole (point a)

Non memorizzano direttamente informazioni personali, tutte le informazioni raccolte infatti sono aggregate e quindi anonime

Since the condensation of the sperm nucleus results in a transcriptionally restrictive state that demands strict control of gene expression at the RNA level, post-transcriptional regulation becomes essential during the latter stages of spermatogenesis [20, 59]

Con el tiempo, las evidencias cientficas no dejan tan clara su utilidad