Explore a comprehensive 23-minute video lecture on the cardiac cycle, covering its five phases, pressure dynamics, valve operations, heart sounds, and ventricular volumes. Gain a deep understanding of the mechanical events occurring during a single heartbeat, including atrial systole, isovolumetric contraction, ejection, isovolumetric relaxation, and passive filling. Learn about the "Bottle Cap Phenomenon" to visualize pressure differences controlling valve operations. Examine a detailed pressure-time graph illustrating left ventricular, left atrial, and aortic pressures throughout the cycle. Discover the origins and significance of heart sounds, including S1, S2, S3, and S4. Understand key concepts like End Diastolic Volume, Stroke Volume, and Ejection Fraction. Perfect for medical students, nursing students, and anyone interested in cardiac physiology.