The digestive ... starts the process of chemical digestion using specialized proteins called enzymes. Secreted at various points along the digestive tract, enzymes break down large molecules ...

Key fact Digestion is the breakdown of large ... It is carried out by the digestive system. We can use different chemicals or reagents in the laboratory to detect if a food type is present ...

The digestive system breaks down food ... from the stomach to the toilet. Teeth break down food in the mouth mechanically, this means they grind it up. Chemical digestion occurs when enzymes ...