What Causes The Lub Dub Sound Of The Heartbeat !!exclusive!! Today

Every time you press your ear to someone’s chest, you hear a rhythmic "lub-dub." This iconic sound is the soundtrack of life, but it isn’t actually the sound of the heart muscle squeezing.

She drew a quick sketch on the exam paper: four rooms, four doors. “The lub is the first sound. It happens when your heart squeezes to push blood out. Those two big doors at the top—the mitral and tricuspid valves— snap shut. Hard. Like slamming two car doors at once.” what causes the lub dub sound of the heartbeat