Lego Terminator T-800

Organic covering
The flesh-covering that is used on the majority of Terminator models has similar qualities to real human muscle and skin, as well as the ability to sweat, simulate breathing, and produce realistic body odor. Although Terminator flesh does contain blood, it only displays very minimal bleeding when damaged and has never been shown to experience any kind of profuse bleeding even from massive lacerations, dozens of gunshot wounds, or even complete removal. In the absence of a circulatory system, the flesh uses a system of "nanobots" which maintain the skin. It is unknown what biological processes take place to sustain the flesh covering, since Terminators do not require the consumption of food. Under 2007-era analysis, this blood is shown to be similar to human blood, using a synthetic oxygen carrier rather than human red blood cells, as Terminator endoskeletons contain no bone marrow. Terminator flesh heals by itself, and at a much faster rate than normal human tissue and has never been shown to bruise or discolor from trauma, even after several days. However, a Terminator's flesh covering can die if it sustains adequately massive damage, at which point it takes on a waxy, corpse-like pallor and begins to decompose.
Although clearly not the normal procedure, a bare T-888 endoskeleton is able to grow itself a new flesh covering using 2007 technology (with the assistance of a geneticist and its own knowledge of future formulae) by submerging itself in a blood-like bath. This improvised process results in a deformed covering that has the appearance of a burn victim and lacks its own biological eyes, requiring it to steal some and subsequently undergo cosmetic surgery to produce a more normal appearance. The theft of the eyes suggests that Terminator flesh is capable of accepting some degree of organ grafts from ordinary humans, that it can circumvent transplant rejection, and is capable of sustaining the life of the grafted tissue via its own unknown biological process.