Organs or no organs?

I know the Terminators have skin, can detect pain/temperature changes so they have nerves, have real eyes, blood vessels and tongue but how do those work??? What keeps the blood flowing, what do the nerves connect to? I'm confused on how they have outer organs but not inside ones to connect to. How do mentioned body parts get the proper oxygen and vitamins needed to not rot and fall off.

Apologies for bad grammar I haven't slept in a while