I think to myself upon seeing a corpse/picture of a corpse, "that should bother me"
But ration kicks in telling me it would do no good, so i don't choose to act out that emotion, and it doesn't bother me.
I have to choose to feel something when i see it... (some may say i have to pretend to feel it, but I don't see it as such)
So the short answer is... essentially nothing...unless i see blood gushing out, for some reason that has a base biological effect on me, and i'll thank you to help me stand back up after fainting when you're done bandaging the person... If they're still alive that is.
The other thing that can bother me from death, is nothing to do with the death itself, but injustice rings a strong tune with me. hrm... it's like.. about the same as being forced to look someone in the eyes if you know what i mean.