Heartbeat Lub Dub – Instant & Certified

The "lub" sound marks the beginning of systole —the phase of ventricular contraction.

The "lub-dub" sound of a heartbeat is the sound of your heart valves closing to control blood flow. Each heartbeat consists of two distinct sounds that represent different parts of the cardiac cycle: The "Lub" (First Heart Sound) : This sound, known as heartbeat lub dub

Here are a few options for a post about a "heartbeat lub dub," depending on the vibe you are looking for: The "lub" sound marks the beginning of systole

: 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. heartbeat lub dub