Question 4(a)(iii)
[Maximum number: 3]
The diagram shows the human alimentary canal.
Describe the role of bile in digestion.
Edexcel IGCSE Biology 2.31 Energy content in food
Practise explaining bile in digestion, including neutralising stomach acid and emulsifying lipids for effective enzyme action.
How this is tested
- explain how bile neutralises stomach acid to give a suitable pH for enzymes
- link emulsification of lipids to smaller droplets and increased surface area for lipase