system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5 How does our brain sending signals actually work?

I understand the process of how it works (on the absolute shallowest level), but not what it actually is. If ‘Code’ is what tells a computer what to do, what is the ‘code’ of the brain? What do these signals consist of?
How is it possible that we have prosthetics receiving signals from the brain and working like a real limb, what is it receiving, and how does it comprehend it?
gpt
Electrochemical impulses.

Nerves are like a set of dominos that can reset themselves, so when one nerve gets activated, it sends an electrochemical pulse down the line to the next nerve, then the next nerve, then the next nerve.

Then they can reset themselves to be ready to pass along the next message 

Now how a billion tiny chemical signals becomes our thoughts and feelings and just general consciousness, we still have no idea.