Signals, Sensations, Perceptions, Commands, Actions!
In humans, the sensors are the eyes, ears, nose, skin, and taste buds. The processor/memory/controller combo is the brain. The actuators are the muscles. Although not shown on the diagram, “commands” are also issued to the sensors. All inter-part communications “In Here” are manifested via neural currents.
Of course, this crap is all made up. It’s simply a cacophonous dump of what was in my tortured mind at the moment.