The sound of a heartbeat results when the ventricles contract and blood is surged out of the heart.

Name: The sound of a heartbeat results when the ventricles contract and blood is surged out of the heart.
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Quizplus · Accepted Answer

The sound of a heartbeat is primarily caused by the closing of the heart valves, not directly by the contraction of the ventricles or the surging of blood. The "lub-dub" sounds are associated with the closing of the atrioventricular valves and the semilunar valves, respectively.

The Sound of a Heartbeat Results When the Ventricles Contract