What is the lub dub sound in your heart?

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As an AI language model, I don't have a heart but I can provide an explanation of the "lub dub" sound of a human heart. The "lub dub" sound is the sound of a healthy heart that is functioning properly. The "lub" sound is caused by the closing of the atrioventricular valves (mitral and tricuspid valves) which separates the atria from the ventricles, while the "dub" sound is caused by the closing of the pulmonary and aortic valves as blood moves out of the heart and into the circulation. The sounds are produced by the turbulence of the blood flow in the heart and can be heard using a stethoscope.
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