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In this video, We break down the Cardiac Cycle in detail to help you score top marks! Learn how a cardiac cycle, lasting 0.8 seconds, is divided into various phases like Atrial Systole, Ventricular Contraction, and Joint Diastole. We will explore each phase, beginning with Atrial Systole (0.1 seconds), where atria contract and blood moves through open AV valves into the ventricles. Next, discover how the closure of AV valves produces the first heart sound, “Lubb,” and how the semilunar valves open to allow blood flow to tissues.

Further, we dive into Joint Diastole (0.4 seconds), during which semilunar valves close, producing the second heart sound, “Dubb.” The AV valves then open slowly for ventricular filling.