We have that the second heart sound is heard when the semilunar valves opens.
Cardiac Cycle
The cardiac cycle is simply defined as the complete process of the human heart from the beginning of one heartbeat to the beginning of the next.
Generally, the second heart sound is associated with the opening of the semilunar valves.
Therefore, when the semilunar valves opens.
For more information on Valves visit
https://brainly.com/question/2622341
