Question

what other structures travel to the injury site with the white blood cells?

Answer 1

I think it is antibodies because both antibodies and white blood cells both deal with disease and injuries 

Answer 2

The antibodies follow the white blood cell if their is an attack on their organism whatever it may be.If  the white blood cells cant control it the antibodies come in to save the day, but the antibodies kill ALL of the bacteria it touches, including the good ones.