Nanites are a vital part of Synth metabolism. Nanites are nanorobots generated by Synth bodies to handle a large variety of tasks. They are responsible for the healing abilities of synthetic tissues, transportation of materials throughout the body, digestion of ingested materials, the increase or decrease of the sceletal frame, etc. Nanites consist of few components, making them simple, but miniscule machines. Each nanite consists of multiple locomotory parts, like legs and tendrils, mandibles for grasping and manipulation and a battery.
The nanite swarm within a Synth's body will always strive towards re-shaping the body into the shape dictated by the currently active blueprint. This is done by adding or removing tiny chunks of materials around bodyparts, until the body part fits with the blueprint. This also allows the repair, or healing, of internal and external damage, since a damaged part will deviate from the blueprint, which causes the nanite swarm to activate and strive towards repairing the damaged part. This allows a Synth to regenerate tissue and heal themselves slowly over time, using ingested materials. Another, much faster, way of repairing damage to a module is the exchange of the entire module with a new one.
Nanites are constructed within nanite glands. Nanite glands are small, internal Synth organs that generate swarms of nanites and maintain a steady number of nanites within the swarm. Nanites are not capable of constructing more nanites or repairing themselves, so since they also have a limited timespan, the swarm relies on the glands to keep up its numbers. The nanites' limited lifespan and centralized construction is intended to prevent a gray goo event from happening.
Nanite glands are positioned throughout multiple parts of the the body, with the number of glands depending on the size of the Synth. The typical Synth will have 9 to 10 glands, located in logistically advantagious parts throughout the body. Glands are particularly concentrated around the center of the torso, to assist in internal processes of surrounding organs, like the digestion and transportation of materials.
Glands are connected through a network of capillary tubes filled with fullerene solution. The fullerene solution circulates through the capillary system, allowing transportation of nanites, as well as materials inbetween glands. This is meant to enable transportation of required materials from the digestive system to the parts of the body where they are needed for tissue repairs and growth.