Cardiac cycle of the heart


Cardiac cycle of the heart

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  • 5 phases of cardiac cycle of the heart
  • Cardiac cycle time
  • Cardiac cycle diagram

    • 5 phases of cardiac cycle of the heart...

    Cardiac cycle

    Performance of the human heart

    The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next.[1] It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, called systole.[1] After emptying, the heart relaxes and expands to receive another influx of blood returning from the lungs and other systems of the body, before again contracting to pump blood to the lungs and those systems.

    Assuming a healthy heart and a typical rate of 70 to 75 beats per minute, each cardiac cycle, or heartbeat, takes about 0.8 second to complete the cycle.[2][3] Duration of the cardiac cycle is inversely proportional to the heart rate.[4]

    Description

    There are two atrial and two ventricle chambers of the heart; they are paired as the left heart and the righ