[Verse 1] Inside your chest beats a dual pump machine Four chambers working in perfect routine Right side takes the blue blood flowing back home Through vena cava to where it belongs The right atrium catches what the body returns Superior, inferior, coronary burns Through tricuspid valve with its three-leaflet door Into right ventricle, thin-walled for sure [Chorus] Two sides, four chambers, one beating heart Right side to lungs, left side restart Low pressure twenty to thirty on right High pressure hundred-twenty takes flight Remember the flow, remember the way Dual pump system working all day [Verse 2] Right ventricle crescent pumps blood with ease Through pulmonary valve to arteries Left and right branches carry blue blood along To lung capillaries where gas exchange is strong Carbon dioxide diffuses right out Oxygen enters without any doubt Ninety-eight percent saturation complete Oxygenated blood ready to meet [Chorus] Two sides, four chambers, one beating heart Right side to lungs, left side restart Low pressure twenty to thirty on right High pressure hundred-twenty takes flight Remember the flow, remember the way Dual pump system working all day [Verse 3] Left atrium receives from pulmonary veins Four vessels bringing what the body gains Through mitral valve with its two-leaflet gate Into left ventricle, thick walls await The powerhouse chamber, cone-shaped and strong Pumps red blood through aorta along Systemic circulation feeds every part This is your normal four-chamber heart [Chorus] Two sides, four chambers, one beating heart Right side to lungs, left side restart Low pressure twenty to thirty on right High pressure hundred-twenty takes flight Remember the flow, remember the way Dual pump system working all day [Bridge] Tricuspid right, mitral on left Three leaflets here, two leaflets there Semilunar valves guard the exit routes Pulmonary, aortic, follow the suit [Outro] From body to right to lungs and back Left side pumps red through aortic track Four chambers, two circuits, one perfect design Your heart keeps the rhythm, your lifeline
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