[Verse 1] Four gatekeepers guard the crimson halls Each with one mission when the rhythm calls Forward passage yes, backward passage no Keep the scarlet river in its perfect flow Mitral, tricuspid anchor down below While aortic, pulmonary steal the show [Chorus] Half-moon cusps snap shut with S2's beat Aortic first, then pulmonary's retreat Chordae tendineae hold the strings tight Papillary muscles grip through systole's might Forward flow, backward block That's how every valve should rock [Verse 2] Semilunar crescents face the arterial tide Three thin leaflets opening wide Ventricular pressure pushes them apart Then backflow slams them shut, that's cardiac art Split second timing in the closing sound Aortic beats pulmonary to the ground [Chorus] Half-moon cusps snap shut with S2's beat Aortic first, then pulmonary's retreat Chordae tendineae hold the strings tight Papillary muscles grip through systole's might Forward flow, backward block That's how every valve should rock [Bridge] When stenosis narrows down the gate Forward flow meets a twisted fate Regurgitation's backward leak Makes the chamber muscles weak Both create abnormal strain On the heart's relentless campaign [Verse 3] Atrioventricular valves hang like parachutes Anchored firm by fibrous shoots Prolapse threatens when the tethers fail But papillary strength will always prevail Mitral left and tricuspid right Sealing chambers watertight [Chorus] Half-moon cusps snap shut with S2's beat Aortic first, then pulmonary's retreat Chordae tendineae hold the strings tight Papillary muscles grip through systole's might Forward flow, backward block That's how every valve should rock [Outro] Simple job but perfect execution Each valve guards its own solution Forward yes and backward never Cardiac rhythm now and forever
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