And notice the black curve eventually reaches a maximum velocity. That's the point when all the active sites of all the enzymes are filled by that substrate. Now, in the presence of an inhibitor, what happens is because the inhibitor resembles that substrate, it's going to bind to that same active side. And once it binds, it forms this enzyme inhibitor complex. And because that inhibitor is found in that active side, the substrate is not found in that active side. And so that enzyme is inhibited.