[Verse 1] Follow the river of red through the ribs and the chest, tired blue blood dragging in, begging for a rest, it slips through the lungs like a courier at dawn, drops off what's used up, picks up fresh cargo, and it's gone. [Chorus] In goes oxygen, out goes carbon dioxide, that's the swap that happens at the lung's tide, air gives, blood takes, that's the oldest trade in town, breathe it up, ship it out, keep the whole loop turning round. Right side's easy, left side's strong, short hop, long haul, that's the blood song. [Verse 2] Picture the air sacs, tiny grapes in a cluster, wrapped in walls so diaphanous, thin as a whisper, so sheer and so see-through the gases just glide, oxygen slips inward, carbon dioxide slides outside. No pumps at that border, no muscle, no might, just molecules wandering from crowded to light, high to low, that's the only law that they heed, in with the oxygen, out with the gas we don't need. [Verse 3] Now the heart's got two chambers with two different jobs, the right one's a courier, not built to be a slob, it only ships blood on a quick little jaunt, just up to the lungs, and back—no farther, don't want. The left side's the workhorse, the marathon runner, pushing to fingertips, forehead, and stomach's back burner, so it thickens its walls, builds muscle like armor, while the right stays lean, no need for that drama. [Chorus] In goes oxygen, out goes carbon dioxide, that's the swap that happens at the lung's tide, air gives, blood takes, that's the oldest trade in town, breathe it up, ship it out, keep the whole loop turning round. Right side's easy, left side's strong, short hop, long haul, that's the blood song. [Bridge] Close your eyes, trace the circuit, feel the double lane— one road short and easy, one road built for strain, lungs are just next door, a hop, skip, no big fuss, but the body's every cell needs the left side's mighty thrust. That's why the right stays modest, a gentle, unstrained beat, while the left builds thick and burly to send blood to your feet. [Chorus] In goes oxygen, out goes carbon dioxide, that's the swap that happens at the lung's tide, air gives, blood takes, that's the oldest trade in town, breathe it up, ship it out, keep the whole loop turning round. Right side's easy, left side's strong, short hop, long haul, that's the blood song. [Outro] Short hop, long haul— in with the oxygen, out with the gas that's spent, that's the loop, that's the deal, that's the blood you've got on rent.
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