The lub is the big push and and the dub is the reloading push.
What is dub lub sound of the heart?
This sound comes from the valves shutting on the blood inside the heart.
The first sound (the lub) happens when the mitral and tricuspid valves close. The next sound (the dub) happens when the aortic and pulmonary valves close after the blood has been squeezed out of the heart.
Learn more about heart sound here:
https://brainly.com/question/1526802
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