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Solve riddle Lub dub, lub dub...l can always find the group and pace...lub dub, lub dub...l can even make you catch a case...lub dub, lub dub...l live all year in boca not raton...lub dub, lub da dub…'ll surely kill your Corazon.

"Lub dub" is the sound of a heartbeat. Let me work through the clues:
  1. "Lub dub, lub dub" - heartbeat sound
  2. "I can always find the group and pace" - sets the rhythm/rate for the whole heart (group = group rhythm, pace = pacing)
  3. "I can even make you catch a case" - can cause a legal "case" or a medical "case" (arrest?)
  4. "I live all year in boca not raton" - "boca" = mouth in Spanish; NOT "raton" (mouse) - so it lives in the mouth/opening, not the rat. "Boca" also means the opening/mouth of something.
  5. "Lub dub, lub da dub... I'll surely kill your Corazon" - "corazon" = heart in Spanish; something that kills the heart
Putting it together:
  • Sets the pace for the whole heart = pacemaker / SA node
  • Lives in "boca" (the opening/mouth) = the mouth of the heart, the top chamber - the atria... but more specifically the SA node sits at the top right atrium near the opening of the superior vena cava
  • "Catch a case" = cardiac arrest
  • "Kill your corazon" = ventricular fibrillation or a fatal arrhythmia
But the wordplay on "boca not raton" is the key clue. "Boca Raton" is a city in Florida - but the riddle splits it: boca (mouth) not raton (rat). So it lives in the mouth, not the rat. A "boca" clue pointing to something at the mouth/entrance of the heart...
The answer is: V-FIB (Ventricular Fibrillation) - OR more likely...
The answer is COCAINE - No, wait.
Re-reading: "I can always find the group and pace" - this is the SA node (sinoatrial node), the heart's natural pacemaker. It:
  • Finds the group (coordinates the whole heart) and sets the pace (heart rate)
  • Can make you "catch a case" (cardiac arrest / legal trouble if you mess with it)
  • Lives in "boca" - the SA node sits at the opening (boca) of the superior vena cava into the right atrium - literally at the "mouth," not in the ventricle ("raton" sounds like the lower, smaller chamber)
  • Will kill your corazon if it malfunctions
The answer is the SA Node (Sinoatrial Node) - the heart's natural pacemaker, which lives at the "mouth" (boca) of the superior vena cava, sets the group rhythm and pace, and whose failure leads to fatal arrhythmia (killing your corazon).
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