[Verse 1] Right atrium first, the thin-walled receiving hall, Superior vena cava drops its cargo, hears the call, Inferior vena cava joins, coronary sinus too, Three rivers pouring inward, one chamber pulling through, Walls are paper-soft, a low-pressure gentle guest, Tricuspid swings the door and sends it toward the chest. [Chorus] Right side sips it slow, left side slams it hard, Vena cavas feed the top, aorta guards the yard, Tricuspid, pulmonary, mitral, aortic gate, Four valves keep the traffic moving, nothing hesitates, RA to RV, LA to LV, the pattern never bends, Follow the four small rooms till the circuit never ends. [Verse 2] Right ventricle's a crescent, moon-shaped and rough inside, Coarse trabeculations ridge the walls like canyon tide, Only three to five millimeters, thin but built for speed, Short hop to the lungs is all this pump chamber's gonna need, Pulmonary valve swings open, sends the blood out west, Toward the lungs for oxygen, that's the low-pressure quest. [Verse 3] Left atrium sits posterior, quiet behind the scene, Four pulmonary veins return what the lungs made clean, Oxygen-rich cargo drifting back from the exchange, Mitral valve's the gateway to the chamber built for range, Left ventricle waits conical, sculpted like a horn, Eight to twelve millimeters thick, the apex here is born. [Chorus] Right side sips it slow, left side slams it hard, Vena cavas feed the top, aorta guards the yard, Tricuspid, pulmonary, mitral, aortic gate, Four valves keep the traffic moving, nothing hesitates, RA to RV, LA to LV, the pattern never bends, Follow the four small rooms till the circuit never ends. [Verse 4] Aortic valve's the exit, the biggest push it's got, Blood shoots to the body, every organ, every plot, Right ventricle's a rowboat, left's an ocean liner, hear? Pulmonary trip is short, systemic trip's the wary, Thin walls handle local runs, thick walls handle far, That's why the left ventricle's the sturdiest little star. [Verse 5] Sinoatrial node ignites the spark up in the right, AV node catches, holds it, then releases it to flight, Bundle branches carry current down the septal wall, Purkinje fibers scatter it, and that's the final call, Systole and diastole, the squeeze and then the rest, Every heartbeat is this circuit passing every test. [Bridge] Superior, inferior, sinus—three feed the right, Four veins whisper to the left, that's the atrium's delight, Tricuspid, mitral, inlet valves that guide the tide, Pulmonary, aortic, outlets standing side by side, Say it soft now: thin then thick, short then far, That's the whole heart's story in a four-room bar. [Outro] Four rooms, one rhythm, the whole map makes sense, Thin to thick, right to left, the heart's own residence.
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