[Verse 1] Female: In the lungs the blood goes wandering, picking up its oxygen crown Male: Trading off the carbon dioxide, letting the fresh air down Female: Now it needs a highway home, four lanes wide and true Male: Two peel off the left lung, two more slip out the right lung too [Chorus] Both: Four pulmonary veins, count them on your hand Two from the left, two from the right, that's how the rivers stand They rush into the left atrium, that's their only door Oxygen-rich and racing — unlike any vein before [Verse 2] Male: Every other vein you'll meet is hauling tired old blood Female: Dim and low on oxygen, slow and thick like flood Male: Vena cava, jugular, all carrying the spent Female: But pulmonary veins are rebels, wearing a different scent [Chorus] Both: Four pulmonary veins, count them on your hand Two from the left, two from the right, that's how the rivers stand They rush into the left atrium, that's their only door Oxygen-rich and racing — unlike any vein before [Bridge] Female: Arteries carry oxygen out, veins bring the leftovers home Male: That's the usual habit, that's how the vessels roam Both: Except right here, right here, pulmonary's flipping the plot Fresh and bright, not tattered blood — the oddball of the lot [Verse 3] Male: So when you're tracing the loop, don't mix the names up wrong Female: Pulmonary artery runs low, the vein sings a brighter song Male: One is heading to the lungs, the other's coming back Female: Four veins, one atrium — that's the oxygen track [Chorus] Both: Four pulmonary veins, count them on your hand Two from the left, two from the right, that's how the rivers stand They rush into the left atrium, that's their only door Oxygen-rich and racing — unlike any vein before [Verse 4] Female: Picture the heart as a busy house, with doors on every side Male: The left atrium's got two windows, where the pulmonary tides ride Female: No valve to slow the pulmonary flow, just muscle guarding the gate Male: Straight into the ventricle's push, ready to circulate through fate [Bridge 2] Both: Left side, right side, upper, lower — four is the sacred count Female: Miss one and the numbers falter, the whole design won't amount Male: Surgeons study every branch, cardiologists trace the line Female: Ablation maps and catheters, following that bright design Both: Four pulmonary veins, oxygen's own design [Chorus] Both: Four pulmonary veins, count them on your hand Two from the left, two from the right, that's how the rivers stand They rush into the left atrium, that's their only door Oxygen-rich and racing — unlike any vein before [Outro] Female: Four veins, left atrium Male: Oxygen-rich and true Both: The one exception in the whole map — now that loop lives inside you
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