Matching Pairs CVS: Heart - Cardiac CycleOnline version Revision by Dr MAHABOOB KHAN SULAIMAN 1 Ventricular ejection 2 Isovolumetric ventricular contraction 3 Stroke Volume (SV) 4 Late Diastole 5 Atrial Systole 6 Isovolumetric ventricular relaxation Both atria and ventricles relaxed, ventricles fill passively stands for (EDV - ESV) i.,e (130 - 60 = 70 ml). This is volume of blood ejected from each ventricle per beat. Phase after ventricular systole. Ventricles relax due to T wave in ECG (ventricular repolarization) and ventricular pressure falls causing semilunar valve to close (meanwhile atria fill with venous return blood, then ventricle also get filled passively). Its the 1st phase of ventricular contraction. Caused by ventricular depolarization (QRS complex). AV valves are closed but pressure is not enough to open semilunar valves yet. Leads to ventricular systole Ventricle pressure exceeds than pressure in arteries, so semilunar valves open and about 70 ml blood is ejected from each ventricle, out of heart. At the end of this you get "End systolic volume" (ESV), ~60 ml blood left in each ventricle. Refers to atrial contraction. Accounts for 20% filling of blood of ventricles. At the end of this you will get "End diastolic volume" (EDV), ~130 ml blood left in each ventricle
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