[Verse 1] Somewhere past the lungs, where the oxygen hides, four soft vessels open like petals unfolding, pulmonary veins — a twist worth holding — veins that carry sunlight-blood, not the tired, not the blue. No pulse of a pump here, just the drift and the glide, sliding toward a chamber, small and dim and wide, the left atrium waits, a quiet antechamber, holding its breath before the tide. [Chorus] Pulmonary veins, bringing blood back from the sky, left atrium, the pause before the plunge, mitral valve, two flaps that never lie, left ventricle, the muscle where the journey lunges. Vein to atrium, valve to ventricle, say it slow now, let the order stick, vein, atrium, valve, ventricle — that's the loop, that's the trick. [Verse 2] The atrium tightens, a gentle squeeze, not a shout, sends the blood downward, no hesitation, no doubt, through the mitral valve, named for a bishop's tall hat, two leaflets close like hands in prayer, quiet as that. Shut tight behind it so nothing slips back, one direction only, no detour, no crack, into the left ventricle, thickest wall in the house, the strongest room, built to rouse. [Chorus] Pulmonary veins, bringing blood back from the sky, left atrium, the pause before the plunge, mitral valve, two flaps that never lie, left ventricle, the muscle where the journey lunges. Vein to atrium, valve to ventricle, say it slow now, let the order stick, vein, atrium, valve, ventricle — that's the loop, that's the trick. [Bridge] Say it once for the vessel, say it twice for the room, say it soft for the valve that closes like a loom, say it low for the ventricle, the fist inside your chest — four small words carry oxygen to all the rest. Vein... atrium... valve... ventricle... whispered like a heartbeat, hypnotic, slow, and full. [Verse 3] Now the ventricle coils, gathers up its might, this is the launch pad, the one before the flight, next stop the great aorta, out to the body's every mile, but that's a verse for later, a different while. For now just hold the order, the sequence, the line, vein, atrium, valve, ventricle — one unbroken design. [Chorus] Pulmonary veins, bringing blood back from the sky, left atrium, the pause before the plunge, mitral valve, two flaps that never lie, left ventricle, the muscle where the journey lunges. Vein to atrium, valve to ventricle, say it slow now, let the order stick, vein, atrium, valve, ventricle — that's the loop, that's the trick. [Outro] Vein... atrium... valve... ventricle... the left side hums it, over and over, low and full. Vein, atrium, valve, ventricle — carry it with you, carry it on.
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