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lists events occurring during one cardiac cycle.  arrange these steps in their correct order 

A. AV

valves are forced open

B. Semilunar valves are forced shut

C. Period of isovolumetric contraction

D. Period of isovolumetric relaxation

E. As ventricles relax blood in aorta & pulmonary trunk begin to move backwards towards ventricles

F. Pressure in ventricles exceeds pressure in the aorta & pulmonary trunk

G. SA nodes fires leading to atrial contraction

H. Blood flows passively into ventricles

I. Semilunar valves are forced open & blood is ejected from ventricles

J. Pressure in ventricles increases & closes AV valves

K. Residual atrial blood flows into the ventricles

L. Pressure of blood in atria exceeds that in the ventricles

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