2.30 understand that bile is produced in the liver and stored in the gall bladder, and understand the role of bile in neutralising stomach acid and emulsifying lipids

Bile is produced in the liver and is stored in the gall bladder before it's released into the small intestine.

The hydrochloric acid in the stomach makes the pH too acidic (pH2) for enzymes in the small intestine to work properly. However, bile is alkali so it neutralises the acid, making conditions alkaline - this is useful as the enzymes in the small intestine work best in alkaline conditions.

Furthermore, bile also emulsifies lipids (fats). This basically means it breaks down the fat into tiny droplets - this is useful as it gives a much bigger surface area of fat for the enzyme lipase to work on, this makes digestion faster.