User blog:GIVE US MOTHER 3/Robots bleeding?

Ok so there is one thing that confuses me about megaman. In a cinematic from megaman x1 or x5 (can't remember which one) zero has just killed a bunch of robots and has blood all over his hands, in the japanese megaman zero franchise the reploids are shown to bleed when sliced with zero's z saber. Basically what im getting at here is why do the robots bleed? I havent played all of megaman, x, zx, or battle network so i may be missing something. Are the reploids maybe like cyborgs or something? Im just really confused