There's a lot that is known about DMT pharmacology, where it works in the brain, how it is metabolized, etc etc.
You can check our FAQ for starters, you can check the book DMT: Spirit Molecule for a slightly outdated but interesting read, you can read the wikipedia entry, and you can also simply go to scholar.google.com and search things like "dmt pharmacology", "dmt brain", etc and limit the search to whatever has come out in the last 5-10 years. You can generally download the full science papers for free by pasting the paper link or publication name on the search bar of sci-hub.tw
If there's anything you still don't understand after doing some research, feel free to ask and we can try and help if we know the answer