The mechanical choreography of the human heart's rhythmic cycle
In short: Understanding the cardiac cycle is essential for mastering A-Level Biology. This video breaks down the precise sequence of muscle contractions and valve movements that power your circulation.
The cardiac cycle consists of three primary stages: atrial systole, ventricular systole, and diastole. During atrial systole, the atria contract to open the atrioventricular valves. This is followed by ventricular systole, where the ventricles contract, closing the atrioventricular valves while simultaneously opening the semi-lunar valves to eject blood.
The cycle concludes with diastole, characterized by the relaxation of both atria and ventricles and the closing of the semi-lunar valves. The video also covers essential physiological metrics, including how to calculate cardiac output using heart rate and stroke volume—a requirement for specific exam boards like AQA.
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Sources
- Summary by Intellect · source: A-Level Biology - Cardiac Cycle - Atrial Systole | Ventricular Systole | Diastole (2027/28 exams)
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