CIE IGCSE Biology: 復(fù)習筆記：7.1.6 Emulsification of Fats & Oils: Extended

Category: IGCSE課程, 國際課程, 教材筆記, 福利干貨 Date: 2022年11月21日上午10:48

CIE IGCSE Biology: 復(fù)習筆記：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 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.

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