Review Note
Last Update: 01/29/2025 02:19 PM
Current Deck: PHYSIOLOGY::exam one
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Commit #272738
Describe this image for ventricles.
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Commit #272738Ventricles
as pumps: during ventricular systole, blood collects in atria. With end of contraction, pressure falls, A-V
valve opens, blood enters. Note last
third of filling is atrial systole. With
onset of ventricular contraction, pressure rises causing A-V valve closure- .02
to .03 seconds needed to raise pressure to point where aortic and pulmonary
valves open. This period is called
isometric contraction or isovolumic contraction. With contraction come period of rapid
ejection (1st
third-70% of blood) and period of slow ejection (2nd
two thirds of blood).