[Verse 1] Four chambers beating, two circuits spinning round Right atrium catches blood that's homeward bound Vena cava highways bring the tired red cells Superior from above, inferior from below tells Tricuspid gateway opens with its triple crown Twenty to thirty pressure, gentle and sound [Chorus] Dual pump symphony, left and right divide Pulmonary circuit, systemic pride RA to RV, lungs renew the flow LA to LV, body needs to know Crescent meets the powerhouse, thin wall thick wall Four-chamber orchestra answering the call [Verse 2] Pulmonary artery splits in semilunar dance Three leaflets open, give deoxygenated chance Capillary beds embrace alveoli tight Carbon dioxide exits, oxygen ignites Ninety-eight percent saturation shining bright Four pulmonary veins return the crimson light [Chorus] Dual pump symphony, left and right divide Pulmonary circuit, systemic pride RA to RV, lungs renew the flow LA to LV, body needs to know Crescent meets the powerhouse, thin wall thick wall Four-chamber orchestra answering the call [Bridge] Mitral valve with two leaves, bicuspid gate Aortic arch curving left, systemic freight One hundred twenty pressure from the muscled cone Left ventricle commander sits upon the throne Coronary sinus whispers secrets back Tricuspid, mitral, valves prevent backtrack [Verse 3] Left atrium reservoir holds the crimson gold Thick-walled fortress pumps through vessels young and old Aorta majesty ascending to the crown Branches feed the brain before descending down Trunk and legs await the high-pressure sound Complete circulation, perfectly designed and wound [Outro] Two pumps, four chambers, valves in perfect time Pulmonary, systemic, anatomical rhyme
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