[Verse 1]
Down in the lungs where the tiny sacs glow
Blood trades its tired cargo, lets the carbon go
Oxygen rushes in like tide against a shore
Painting every cell a brighter shade of crimson, ready to explore
[Verse 2]
Through the pulmonary vein, the quiet homeward lane
Four little rooms are waiting, calling it by name
Not the right, not the tired, not the dusty hall
Straight to the left side chamber, the freshest port of call
[Chorus]
Left is bright, left is new, that's the rule that carries you
Lung to left, that's the only route it's ever known
Crimson cargo, oxygen crowned
Docking where the fresh blood's always found
Left side glowing, right side resting
That's the loop, that's the testing
Follow the flow and you'll never be lost
Left holds the tide that the lungs just tossed
[Verse 3]
The atrium opens, gentle as a sigh
Passes to the ventricle, muscle standing by
Coiled and ready, waiting for the call
To send that bright red cargo out to reach them all
[Verse 4]
Out through the aorta, the grand and open door
Delivery is coming, there's oxygen to pour
Every distant fingertip, every sleepy toe
Depends on this left chamber letting all that brightness go
[Chorus]
Left is bright, left is new, that's the rule that carries you
Lung to left, that's the only route it's ever known
Crimson cargo, oxygen crowned
Docking where the fresh blood's always found
Left side glowing, right side resting
That's the loop, that's the testing
Follow the flow and you'll never be lost
Left holds the tide that the lungs just tossed
[Verse 5]
Meanwhile on the right side, a different kind of song
The weary blood comes home again, dark and traveling long
It gathers in the atrium, drained from every mile
Then down into the ventricle, resting for a while
Out through the pulmonary gate, back to the lung's embrace
To trade the dust for daylight, to find that brighter place
Two sides, one rhythm, a circle without end
Tired blood departing, fresh blood round the bend
[Bridge]
Right side gathers what the body's already spent
Left side gathers what the lungs just sent
Dim to bright, that's the only trip it makes
Remember the color, and you'll never lose your place
Fresh on the left, that's the compass, that's the key
Simple as a tide rolling back out to sea
[Chorus]
Left is bright, left is new, that's the rule that carries you
Lung to left, that's the only route it's ever known
Crimson cargo, oxygen crowned
Docking where the fresh blood's always found
Left side glowing, right side resting
That's the loop, that's the testing
Follow the flow and you'll never be lost
Left holds the tide that the lungs just tossed
[Outro]
Lungs to left, left to the world
Watch the crimson tide unfurled
Fresh and bright, ready to go
That's the heartbeat, that's the flow