Gullet Size. The angle of the points, the shape of the panels, and the width of the gullet plate work together to create a specific gullet size, and that size in turn determines how the saddle sits on the horse.
Carbohydrates and proteins dissolve in water, which allows digestive enzymes to go to work on them, but fat does not. Your liver produces a substance called bile, which is secreted into the small intestine. This breaks up fat in a process called emulsification, which effectively make the fats water-soluble. Digestive enzymes in the small intestine can then break them down.
By forming micelles, bile salts break up (or emulsify) large fat particles into smaller ones. The proteins associated with the micelle also attract the digestive enzyme lipase, which breaks down the fats inside the micelle into their component parts for absorption in the gut. Bile is an important player in the digestive system largely because it helps to digest fats. In the gut, fats exist as relatively large globs that cannot be absorbed. To prepare fats for absorption, they must first be broken down into their component parts. An enzyme called lipase (lip-, fat; -ase, break down) is capable of breaking down the large fat globs.