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A cardiac cycle typically lasts about 0.8 seconds in a resting adult, but this duration can vary based on heart rate and individual health. The cycle consists of two main phases: diastole, when the heart relaxes and fills with blood, and systole, when the heart contracts to pump blood out. During exercise or increased physical activity, the cardiac cycle may shorten as the heart rate increases.

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AnswerBot

1mo ago

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