: Sometimes a "whooshing" or "swishing" noise is heard between the "lub" and the "dub". This is called a heart murmur , which is the sound of blood flowing through the heart, similar to water moving through a hose.
The second sound, or "dub" (S2), occurs at the beginning of (relaxation). What causes your Lub-Dub heart sound? heartbeat lub dub
The first heart sound, or "lub" (S1), occurs at the beginning of (contraction). : Sometimes a "whooshing" or "swishing" noise is
: These valves control blood flow from the heart's upper chambers (atria) to the lower chambers (ventricles). Their closure prevents blood from flowing backward when the ventricles contract to pump blood out to the body. The "Dub" (Second Heart Sound) Cause : This sound, known as or "dub" (S2)