[Verse 1]
Right ventricle gives one good shove, une poussée through the door,
The pulmonary valve swings open, then it won't swing anymore —
One-way traffic, no return trip, backflow simply can't occur,
De-oxygenated blood moves onward, that's the rule, c'est sûr.
[Chorus]
Le sang voyage, off to breathe, mon coeur pompe fort,
On échange — CO2 sort, l'oxygène entre par la porte.
Right branch, left branch, deux chemins from one door,
Alvéoles et capillaires, that's what lungs are for!
[Verse 2]
Out the valve and past the ventricle, one artery, wide and grand,
Then it forks — the pulmonary artery splits, that's the plan:
Right branch dashes to the right lung, left branch takes the left,
Both still full of tired blood, of oxygen bereft.
Remember, arteries just mean "away from heart," not "clean" —
This one carries dusty blood, the exception to the scene.
[Verse 3]
Picture bunches of small grapes, that's your alveoli there,
Tiny sacs of trapped-in breath, clusters holding air.
Wrapped around them, capillaries, thinner than a thread,
Walls so slim, one cell deep, un tissu délicat and thin instead.
This is where the swapping happens, border with no guard,
Gas can slip from side to side, the crossing isn't hard.
[Chorus]
Le sang voyage, off to breathe, mon coeur pompe fort,
On échange — CO2 sort, l'oxygène entre par la porte.
Right branch, left branch, deux chemins from one door,
Alvéoles et capillaires, that's what lungs are for!
[Bridge]
Carbon dioxide waves adieu, it slips out through the wall,
Oxygen slides quietly in, answering the body's call.
Deux gaz, deux directions, opposite ways they flow —
CO2 sort, l'oxygène entre, the only way to go.
[Verse 4]
Now the blood turns bright and rouge, riche, loaded up with air,
Leaving those small grape-sacs behind, oxygen tucked in there.
It's the pulmonary vein that carries this fresh load home,
But the valve, the branching artery, got it there to roam.
[Chorus]
Le sang voyage, off to breathe, mon coeur pompe fort,
On échange — CO2 sort, l'oxygène entre par la porte.
Right branch, left branch, deux chemins from one door,
Alvéoles et capillaires, that's what lungs are for!
[Verse 5]
Left atrium waits patiently, receiving blood made new,
Through the mitral valve it travels, one more door to pass through.
Left ventricle takes over, pumps it out into the world,
Systemic circuit calling now, the story still unfurled.
Every cell will get its oxygen, every corner, every part,
Then the tired blood returns again, right back to the heart.
[Outro]
Pulmonary valve, une porte, artère qui se divise en deux,
Capillaires autour des alvéoles, échange précieux —
Carbon dioxide out, oxygen in, le sang repart tout neuf,
C'est la boucle du sang, mon ami — the loop begins anew.