Digestibility refers to the net amount of protein that is left after the cat food's chemical breakdown in the body. (thedrakecenter.com)
Catalyze chemical breakdown, Chemically assemble organic compounds, Transform chemical energy, Transform radiant energy (light) (asknature.org)
This sets the stage for proper mechanical and chemical breakdown of foods in the stomach, and causes digestive fluids to be secreted in anticipation of food. (onnit.com)