B 1o o d Pre s sure #"$ff..S$p" g$E*ftTgt t'Lab 2IisrtierO'"ltil!1. ,olub,,,the first in a series and the loudest soundo is caused by the closureof the AV valves as ventricular pressure rises above atrial pressure'2. ('D,b"rtfr. ,..onA in u se'ies ""i tttt audible than the lub' is caused bythe closure of the aortic nnJp"i-onary semilunar valves as ventricularpressure falls below atrial pressure'use your stethoscope to listen to.your heart or your lab partner's heart sounds' If youdon't hear anything, check that the t"gglt ;; th: *d oi,tht stethoscope is flipped up(towards you) and tiifi;;;using trti-nut to""d part of the device' If the lab is noisy'do this in the hall.B. Blood and Pulse PressureThe rhythmic expulsion of blood from the left ventricre into the arterial system producesa blood pressureifil. aorlaunO futg. utt.ries'. Blood pressure rises to a maximum(systotic pr.rror.f during the contrirti* or the left ventricle and then falls to aminimum (diastolic pressure) *fr.n ittt left ventricle relaxes to
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