Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The Cardiac Cycle of the heart

  1. Feb 27, 2009 #1
    Hey guys, can someone make things clear for me?

    Does the heart goes atrial systole followed by ventricle systole then followed by both the atrial and ventricle diastole (at once)

    or atrial systole, ventricle systole (at the same time atrial diastole) then only ventricle systole?
  2. jcsd
  3. Feb 27, 2009 #2


    User Avatar

    Atrial systole than ventricular systole followed by complete cardiac diastole.
  4. Feb 27, 2009 #3
    Thanks, by complete cardiac diastole it means both atrial and ventricular diastole happens together right?
  5. Mar 7, 2009 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Partly, yes. The atria need to contract (systole) to fill the relaxed ventricles (diastole), then the filled ventricles contract (systole) to pump blood through the body, while the atria begin to fill (diastole). Then there is a short time when both are relaxed (complete cardiac diastole) before the atria contract again.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook