hm first of all Edward isn't dead, he's just froze as someone already said so that puts another light on the question here.
link
you can find it under the question: Vampires and pregnancy: how does it occur?
Here are parts from it:
Similarly, throughout the vampire's body are many versions of venom-based fluids that retain a marked resemblance to the fluid that was replaced, and function in much the same way and toward the same purpose. Though there is no venom replacement that works precisely like blood, many of the functions of blood are carried on in some form. Also, the nervous system runs in a slightly different but heightened way.he normal reactions of arousal are still present in vampires, made possible by venom-related fluids that cause tissues to react similarly as they do to an influx of blood.
cause there is no blood in vampires (except the one after they feed on humans or animals, though they caugh it out later) stephanie created various fluids similar to venom that will replace blood so that their body could function in a normal way.. so everything's same as it is with humans only there's no blood but all kinds of ''venoms''
=)
