[Verse 1] Deep in the lung, the tiny threads are weaving, Capillaries braiding into rivers leaving, They gather up and grow to just a lucky number four, Two from the left lung, two more from the right side's shore. These four alone carry cargo bright and blazing, The only veins in the body doing something amazing — While every other vein hauls blood that's dark and spent, These four run rich with oxygen, that's the twist God sent. [Chorus] Four veins in, one room to fill, The left atrium's waiting still, Two flaps flutter, not a trio, just a pair, Mitral opens like a door out of nowhere, Into the left ventricle, loaded, standing tall, That's the blueprint, that's the whole blood loop crawl. [Verse 2] The left atrium hums like a lobby full of light, Four separate hallways feeding into one at night, It squeezes gently, no rush, no wild commotion, Just a steady nudge to set the tide in motion. Down through a door with only two flaps swinging, Not the tricuspid's three, a different kind of singing, The mitral valve, named for a bishop's pointed hat, Snaps shut behind the blood so nothing rushes back. [Chorus] Four veins in, one room to fill, The left atrium's waiting still, Two flaps flutter, not a trio, just a pair, Mitral opens like a door out of nowhere, Into the left ventricle, loaded, standing tall, That's the blueprint, that's the whole blood loop crawl. [Verse 3] Now the left ventricle, thick-walled and coiled tight, Holding all that crimson cargo, brimming, burning bright, This is the chamber built to push the farthest mile, Every distant fingertip, every waiting cell in style. It isn't loafing here, it's gathering its power, Getting set to fire blood out within the hour, Biggest job in the loop is waiting on the other side, But for now it just sits full, oxygen riding high inside. [Bridge] Two from the left, two from the right, Four little rivers converging tonight, One thin door with a double-flap key, Left side loud, then the left side free. Say it slow now, lock it in your mind: Veins, then atrium, then valve, you'll find, Ventricle waiting, coiled up like a spring, Ready to launch the body's whole big thing. [Chorus] Four veins in, one room to fill, The left atrium's waiting still, Two flaps flutter, not a trio, just a pair, Mitral opens like a door out of nowhere, Into the left ventricle, loaded, standing tall, That's the blueprint, that's the whole blood loop crawl. [Outro] Four to one, one through two, Two flaps closing, blood pushed through, Left ventricle, bright and full, Steady now — the loop keeps its pull.
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