Missing Rbc

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Across
  1. 5. Hemoglobin showed up in the urine sample — I'm the reason.
  2. 6. I'm the yellow pigment left behind after heme breaks down.
  3. 7. They call me the graveyard of red blood cells.
  4. 8. It happened inside the bloodstream itself. That's my alibi.
Down
  1. 1. I'm the plasma protein that binds free hemoglobin after the crime.
  2. 2. I ruptured right inside the vessel — no one caught me in time.
  3. 3. Free hemoglobin was found floating in the blood — that's me.
  4. 4. I was caught outside the vessels, in the spleen and liver.