Q. Explain and describe the Cardiac Cycle with the help of diagram ? (in 20-24 sentences)

Dear student,
Please find below the answer:

Cardiac Cycle

The cardiac cycle is the sequence of events that occur from the beginning of one heartbeat to the beginning of the next heartbeat.

 In the beginning, all 4 chambers of the heart are in a state of joint diastole (relaxation). Blood from the veins and the vena cava flow into the atria.


 The atrium muscles contract (Atrial systole) pushing the blood through Tricuspid and bicuspid valves into the ventricles. 


Atrium muscles relax (Atria Diastole) and ventricles contract (ventricular systole) causing blood pressure to increase that closes bicuspid and tricuspid valves and opens semilunar valves to force blood into the aorta.


Ventricles relax (ventricular diastole) and ventricular pressure falls, and the semilunar valves close to prevent the backflow of blood into the ventricles.


Blood flows again into the Atrium through veins and it opens the bicuspid and tricuspid valves as it starts to flow into ventricles.


                                     Once again, the entire cycle is repeated.

Hope this helps.

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