[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