Digesting Lipids

Question 1

Describe the hydrolysis of a triglyceride, and what does it produce

Answer 1

Triglycerides undergo hydrolysis of the ester bond by lipase to produce a monoglyceride and 2 fatty acid tails

Question 2

What is a disadvantage of lipids being insoluble

Answer 2

There is a low surface area of lipids and enzymes so less e-s complexes are made

Question 3

What is an adaptation of our body to combat the problems of lipids being insoluble

Answer 3

So we produce bile in the liver and is then stored in the gallbladder and released in the small intestine (its alkali to neutralises the acidity of the stomach acid hcl)

Question 4

What are the 2 things that bile does

Answer 4

1: emulsification
2: forms micelles

Question 5

What is emulsification

Answer 5

Lipids have a low surface area bile emulsifies lipids (forms a ring around lipids) to increase the surface area of them

Question 6

How does it form micelles

Answer 6

Ester bonds are hydrolysed by lipase to form monoglycerides and fatty acids and bile, called micelles. This increases their solubility for absorption

Question 7

Describe lipid absorbtion

Answer 7

1: micelles increase solubility and carry products to ileum cells
2: products diffuse into cell
3: products are modified by Golgi to reform the triglycerides
4: vesicles fuse with membrane and products are exocytosed