Summer Lecture Circulation 1 final

Summer Lecture Circulation 1 final

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Unformatted text preview: of the valves Friday, July 20, 12 The Cycle: Le` Side of the Heart • During the early phase of ventricular systole we see a drama(c change in pressure but no change in blood volume – Isovolumetric contrac(on • Reason the during the early phase of systole the ventricular pressure is not sufficient to push open the aor(c valve – Hence the increase in pressure but no change in volume • Start of Ventricular Systole Friday, July 20, 12 Atrial Systole • At the start of atrial systole, the ventricles are already filled to ~70% capacity due to passive blood flow. • As the atria contract, rising atrial pressures provide the missing 30 percent by pushing blood through the open AV valves. • Atrial systole essentially "tops off" the ventricles. Friday, July 20, 12 Ventricular Systole #1 AV = atrioventricular • As atrial systole ends, ventricular systole begins. • When t...
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This note was uploaded on 10/10/2013 for the course BIO 1440 taught by Professor Booker during the Spring '13 term at Cornell University (Engineering School).

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