Systole. The chamber contracts. Pressure peaks. Blood explodes into the aorta. The mitral valve whispers goodbye as it snaps shut. This is the sound of doing .

The marks Diastole . The ventricles relax. But wait—the blood tries to flow backward. Luckily, the pulmonary and aortic valves snap closed to stop it. That snapping echo? That’s your 'Dub.'

Here is content written for the phrase broken down by format (social media, educational, and poetic). Option 1: Instagram/TikTok Caption (Educational & Engaging) Headline: Your heart’s secret rhythm: Lub Dub. 🫀🎧

In the language of the chest wall, there are only two syllables.