CIE IGCSE Biology: 复习笔记：7.1.6 Emulsification of Fats & Oils: Extended
CIE IGCSE Biology: 复习笔记：7.1.6 Emulsification of Fats & Oils: Extended
Emulsification of Fats & Oils: Extended
- Cells in the liver produce bile which is then stored in the gallbladder
Bile production and secretion
Bile has two main roles:
- It is alkaline to neutralise the hydrochloric acid which comes from the stomach
- The enzymes in the small intestine have a higher (more alkaline) optimum pH than those in the stomach
- It breaks down large drops of fat into smaller ones. This is known as emulsification. The larger surface area allows lipase to chemically break down the lipid into glycerol and fatty acids faster
Exam Tip
Emulsification is the equivalent of tearing a large piece of paper into smaller pieces of paper.This is an example of mechanical digestion, not chemical digestion – breaking something into smaller pieces does not break bonds or change the chemical structure of the molecules which make it up, which is the definition of chemical digestion.
转载自savemyexams
国际竞赛真题资料-点击免费领取！
美高学分项目重磅来袭！立即了解
2025欧几里得数学竞赛报名开启！
