What Causes The Lub Dub Sound Of The Heartbeat Extra Quality 【DELUXE | 2027】

“Exactly. That’s your blood saying, ‘No going back!’” She tapped the paper. “Then the heart keeps pushing. Blood shoots into the big pipes—the aorta and pulmonary artery. The second sound, the dub , happens when the heart relaxes. Those two exit doors—the aortic and pulmonic valves—slam shut. Dub. ”

The boy, Leo, looked up. “Why does it make that sound? Like a tiny shoe inside?” what causes the lub dub sound of the heartbeat

“Perfect,” she said. “Your doors are doing their job.” “Exactly

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.” Blood shoots into the big pipes—the aorta and

“So it’s not the muscle,” Leo whispered. “It’s the valves. The doors.”

“Doors?”