But many futurists say enhancement technologies will likely be used to transform the whole body, not just one part of it.This includes efforts to manufacture synthetic blood, which to this point have been focused on therapeutic goals.But as with CRISPR and gene editing, artificial blood could ultimately be used as part of a broader effort at human enhancement.It could be engineered to clot much faster than natural human blood, for instance, preventing people from bleeding to death.Or it could be designed to continuously monitor a person’s arteries and keep them free of plaque, thus preventing a heart attack.Synthetic white blood cells also could potentially be programmed.Indeed, like virtually any computer, these cells could receive “software updates” that would allow them to fight a variety of threats, such as a new infection or a specific kind of cancer.Scientists already are developing and testing nanoparticles that could enter the bloodstream and deliver medicine to targeted areas.These microscopic particles are a far cry from synthetic blood, since they would be used once and for very specific tasks – such as delivering small doses of chemotherapy directly to cancer cells.