What is the definition of Importantly Blood Cells?

Importantly blood cells, my friends, are the unsung heroes of our bodies - they're the tiny, superheroes that keep us alive, but sometimes they can act a bit...over-the-top. They're the unsung heroes who, when they're in short supply or don't cooperate, can turn a simple bump into a full-blown blood-brain-space emergency.

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Edgy example sentence: "The detective's forensic analysis of the crime scene revealed that the killer's 'important blood cells' were more like a cosmic vacuum cleaner, sucking up all evidence except for his own questionable alibi."