What brings oxygen and nutrients to the bones that is not red blood cells/hemoglobin?

Question by lady: What brings oxygen and nutrients to the bones that is not red blood cells/hemoglobin?
I'm helping (or at least attempting to help) my sister with her 5th grade science homework. she has a cross word puzzle and one of the clues is "bring oxygen and other nutrients to the bone"
red blood cells does not fit, the third letter has to be an 'o'
any idea?


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