processes

• ingestion is the intake of food into the body
• digestion is when food molecules are broken down into simpler molecules
• absorption is when digested food materials are absorbed by the body cells
• amino acids - building blocks of proteins, 20 amino acids
• carbohydrates become simple sugars
• fats become fatty acids for energy, insulation, and storage of energy
• villi- responsible for nutrient absorption
• absorption: villi to blood vessel to liver
• assimilation- transport and use of absorbed nutrients by the cells of the body
• Elimination- passing of undigested material out of the digestive tract
• elimination: feces goes to rectum then nerves tell brain to let the feces out the anus