[Verse 1 — Male, Right Side] Cava superior, cava inferior, feeding the right hall, Vena cava whispers to the atrium, answering the call, Tricuspid swings open, three flaps in a row, Right ventricle loads up, ready to blow, Pulmonic valve cracks, the artery unwinds, Blue blood ships out to the lung's tidelines, Twenty-five over five, that's the pressure I keep, Low and slow, like a river running deep. [Verse 2 — Female, Left Side] Lungs hand it back through four pulmonary veins, Oxygen riding shotgun, washing out the stains, Left atrium catches it, mitral doors swing wide, Left ventricle flexes, thick-walled, full of pride, Aortic valve fires like a cannon at dawn, Into the aorta, the whole body's drawn, One-twenty over eighty, the pressure I command, High and loud, pushing blood to your hand. [Chorus] Right side low, left side glow, Blue goes to the lungs, red's the body's flow, Tricuspid, pulmonic — mitral, aortic gate, Two circuits in series, never sharing a plate, Never mix, never bleed into each other's lane, That's the whole heart working, no wire crossed again. [Verse 3 — Trade lines] M: Deoxygenated cargo, dim and thick and slow, F: Oxygenated current, bright and built to go, M: My side's a puddle pressure, gentle on the wall, F: My side's a fire hose, answering the call, M: Same four chambers, different jobs to do, F: One machine, two systems, running the whole crew. [Verse 4] The septum is the border, the wall that keeps the peace, Foramen ovale closes, the shunting has to cease, Ductus arteriosus, open when you're new, Seals within the week, then the split rings true, Complete separation — the anatomical creed, Every truncus repair chasing that exact same deed, Two rivers, banks apart, from the atrium to the aorta, Cross the wall and you've built yourself a disorder. [Verse 5] Cyanotic babies, mixing where it shouldn't be, Listen for the murmur, that's the leak you'll see, Echo shows the shunt, the pressure tells the tale, Catheter confirms it, numbers never fail, Patch the hole, tie the duct, rebuild the wall again, Restore the separation, let the two loops reign. [Bridge] SVC, IVC, RA, tricuspid, RV, Pulmonic, PA, lungs — then back to me, Pulmonary vein, LA, mitral, LV, Aortic, aorta, body — that's the key. [Chorus] Right side low, left side glow, Blue goes to the lungs, red's the body's flow, Tricuspid, pulmonic — mitral, aortic gate, Two circuits in series, never sharing a plate, Never mix, never bleed into each other's lane, That's the whole heart working, no wire crossed again. [Outro] Two loops, one engine, never crossing wires, Low side breathing, high side never tires, Follow the pressure, follow where it's due, Separate forever — that's the repair we're chasing too.
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