Lub-dub Sounds -

Let’s pull back the curtain on the human body’s most important soundtrack. In simple terms, the "lub-dub" is the sound of your heart valves snapping shut.

Think of your heart as a house with four rooms (chambers) and four doors (valves). To get blood moving in the right direction, those doors must open to let blood through and then slam shut to prevent it from leaking backward. The "lub" and "dub" are the sonic booms of those doors closing. The first sound, "Lub" (clinically known as S1 ), marks the beginning of systole —the moment your heart squeezes blood out to the body. lub-dub sounds

A slightly lower-pitched, longer "lub."

Spoiler alert: It’s not the heart muscle contracting, and it’s not the blood whooshing around. Let’s pull back the curtain on the human

Thump-thump. Thump-thump.

A sharper, higher-pitched, shorter "dub." To get blood moving in the right direction,