We call them high energy electrons because they're used to form the high energy ATP molecules across the electron transport chain found on the inner membrane of the mitochondria. So essentially, these electrons produced here flow across these membranes. So we have one, two, three and four. And then we have this Atpace pump that generates ATP molecules. And as electrons flow, H plus ions essentially are pulled this way because every time, let's say this molecule, this molecule and this molecule gives off those H ions, they are pulled from the matrix into the inter membrane space that creates a proton gradient, where we have a high concentration of H plus ions in this space. And then this final ATP ATP based protein can use that gradient to drive the formation of those ATP molecules.