Final answer:
Digestion is the process of breaking down food into nutrients. Chemical digestion begins in the mouth with saliva and continues in the stomach with stomach enzymes. Absorption allows the nutrient molecules to be taken up by the blood and transported to cells throughout the body.
Step-by-step explanation:
**Digestion** is the process of breaking down food into **nutrients**. There are two types of digestion, mechanical and chemical. In mechanical digestion, large chunks of food are broken down into small pieces. Mechanical digestion begins in the mouth and involves physical processes, such as chewing.
In **chemical digestion**, large food molecules are broken down into small nutrient molecules. This is a chemical process which also begins in the mouth as saliva begins to break down food and continues in the stomach as stomach enzymes further digest the food.
**Absorption** is the process that allows substances you eat to be taken up by the blood. After food is broken down into small nutrient molecules, the molecules are absorbed by the blood. After absorption, the nutrient molecules travel in the bloodstream to cells throughout the body. This happens mostly in the small intestine.