Digestive System Processes
The first step to obtaining nutrition is ingestion, a process where food is taken in through the mouth and broken down by teeth and saliva.
Digestion and Absorption
In order for nutrients (carbohydrates, lipids, vitamins) to be absorbed for energy, food must undergo chemical and mechanical digestion.
Undigested food enters the colon where water is reabsorbed into the body and excess waste is eliminated from the anus.