The Digestive System
DIGESTIVE ENZYMES BREAK DOWN BIG MOLECULES
Starch, Proteins and Fats are INSOLUBLE.
Enzymes help to break them down into sugars, amino acids, glycerol and fatty acids which are small enough to pass through the walls of the digestive system.
Bile is produced in the liver. It is stored in the gall bladder before it is released into the small intestine.
The hydrochloric acid in the stomach makes the pH too acidic for enzymes in the small intestine to work properly. Bile is alkaline, it neutralises the acid and makes conditions alkaline
It emulsifies fats. In other words, its breaks down the fat into tiny droplets. It gives the fat a bigger surface area for lipase to work on, which makes its digestion faster.