Question

What is cardiac cycle in detail

Answer 1

The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole (/daɪˈæstəli/), followed by a period of robust contraction and pumping of blood, dubbed systole (/sɪsˈtəli/). After emptying, the heart immediately 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. A normally performing heart must be fully expanded before it can efficiently pump again. Assuming a healthy heart and a typical rate of 70 to 75 beats per minute, each cardiac cycle, or heartbeat, takes about 0.8 seconds to complete the cycle.There are two atrial and two ventriclechambers of the heart; they are paired as the left heart and the right heart—that is, the left atrium with the left ventricle, the right atrium with the right ventricle—and they work in concert to repeat the cardiac cycle continuously, (see cycle diagram at right margin). At the "Start" of the cycle, during ventricular diastole–early, the heart relaxes and expands while receiving blood into both ventricles through both atria; then, near the end of ventricular diastole–late, the two atria begin to contract (atrial systole), and each atrium pumps blood into the ventricle 'below' it.[3] During ventricular systole the ventricles are contracting and vigorously pulsing (or ejecting) two separated blood supplies from the heart—one to the lungs and one to all other body organs and systems—while the two atria are relaxed (atrial diastole).




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Answer 2

Answer:

The rhythmic contraction and relaxation of the chambers of the heart that corresponds to one heartbeat is called Cardiac Cycle.

It has two phases :----

• Systole.
• Diastole.

Explanation:

The Cardiac Cycle is the performance of the Human heart.

Sequence of event that occurs during one heart beat is called o cardiac Cycle.

Cardiac cycle takes a very short time on just 8 seconds.