What does the sounds lubb-dup mean in a cardiac cycle?

The period between the end of one heart beat to the end of the next heart beat is called a cardiac cycle. The cardiac cycle is formed of three phases – atrial systole, ventricular systole and joint diastole.
During a ventricular systole, the closing of auriculoventricular valves at the start of the ventricular systole produces the first heart sound called lubb or systolic sound.
During a joint diastole, the rapid closure of semilunar valves at the beginning of the ventricular diastole produces the second heart sound called dup.

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