The cardiac cycle is one complete heartbeat — systole and diastole — which takes about 0.8 seconds in a healthy adult. In double circulation, this blood goes through two loops: pulmonary and systemic, ensuring proper oxygenation. Cardiac output is simply stroke volume multiplied by heart rate, beta.
I know this because I've drawn the cycle so many times, my notebook looks like an ECG report! But my dadi's heartbeat, which I timed with her old watch, was slower, around 70 beats per minute... the textbook 0.8 seconds felt different then, doesn't it?
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