[Verse 1] In a normal heart the pathways are clear Two separate vessels, the design is so dear Right ventricle pumps to pulmonary artery alone Left ventricle sends blood through aorta it's known No mixing occurs, the circuits stay true One hundred percent oxygen coming through [Chorus] But truncus arteriosus changes the game One vessel, one valve, it's not quite the same Complete mixing happens when blood flows as one Eighty to ninety percent when the pumping is done Blue tinged and cyanotic, the oxygen's low That's how truncus arteriosus disrupts normal flow [Verse 2] Deoxygenated blood from the right ventricle starts While oxygenated flows from the left chamber's parts They meet at the VSD, that hole in between Then enter one truncus, a mixing machine To body and lungs the mixed blood will go Partial oxygenation wherever it flows [Chorus] But truncus arteriosus changes the game One vessel, one valve, it's not quite the same Complete mixing happens when blood flows as one Eighty to ninety percent when the pumping is done Blue tinged and cyanotic, the oxygen's low That's how truncus arteriosus disrupts normal flow [Bridge] Normal hearts keep it separate and clean Pulmonary and aortic, two vessels are seen But truncus means sharing, no separation here One common vessel makes the problem so clear [Chorus] Yes truncus arteriosus changes the game One vessel, one valve, it's not quite the same Complete mixing happens when blood flows as one Eighty to ninety percent when the pumping is done Blue tinged and cyanotic, the oxygen's low That's how truncus arteriosus disrupts normal flow [Outro] Remember the difference, it's vital to know Two separate vessels make normal hearts glow But one truncus vessel means mixing will be The cause of cyanosis that we clearly see
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