Mouth S. Amylase Pig, man Glycogen, starch, dextrin Mucin All Lubrication Pregast. Intrinsic factor All Vit. Release, storage, and use of this energy. These organic compounds absorbed in the GI tract. If animals can break these bonds - they can use this energy released from the breaking of these bonds.
Electrons are actually where energy comes from.
So reverse the action to release energy.