What Causes The Lub Dub Sound Of The Heartbeat !exclusive! May 2026
Leo pressed his own palm to his ribs. “Mine sound okay?”
“So it’s not the muscle,” Leo whispered. “It’s the valves. The doors.” what causes the lub dub sound of the heartbeat
The boy, Leo, looked up. “Why does it make that sound? Like a tiny shoe inside?” Leo pressed his own palm to his ribs
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
Lub-dub. Lub-dub. Lub-dub.
“Perfect,” she said. “Your doors are doing their job.”
