Question

What causes the 'lub' and the 'dup' sounds of a heartbeat?

Answer 1

the tricuspid and mitral valves closing. The" DUB" is the sound of the aortic and pulmonary valves closing.

Answer 2

$\huge{Hello Friend}$ ❤️❤️

The answer of u r question is..✌️✌️

✔️✔️The causes of the lub and the dub sounds of a heart beat is the Triaucpid and mitral valves. closing✔️✔️

Hope it helps uu!!⭕️⭕️

Thank you..⭐️⭐️⭐️