What Makes The Lub Dub Sound _hot_ Jun 2026

Once the blood has been pushed out of the ventricles, the blood in the arteries tries to rush back into the heart due to gravity and pressure changes. To stop this backward flow, two different valves slam shut: the and the pulmonary valve .

Here’s a social media post (Instagram, Twitter, Facebook) explaining the “lub-dub” sound: what makes the lub dub sound