If you are beginning with physiology of the cardiac cycle, this might be the best video for you. In this lecture comparison method is used, so that you can compare different phases and how changes in pressure occur, what is situation of valves, what is heart sound and what waves are produced in EKG at that phase. Timeline 0:00 Introduction 0:13 Basics of cardiac cycle 0:30 Contents of video 1:13 Mid to late ventricular diastole 6:37 Isovolumetric contraction(systole) 12:10 Mid to late ventricular systole (ventricular ejection) 16:57 Isovolumetric relaxation