Digestion and absorption of lipids

Question 1

What is the function of undigested lipids

Answer 1

a concentrated energy source for the body

Question 2

What are lipids broken down to in order to be absorbed

Answer 2

Monoglycerides and fatty acids

Question 3

How does a small amount of lipid digestion occur in the stomach

Answer 3

By lingual and gastric lipase

Question 4

When is lingual lipase activated

Answer 4

When it reaches the acidic environment of the stomach

Question 5

what does gastric lipase breakdown

Answer 5

Triglycerides

Question 6

Why does gastric lipase have a limited role in the stomach

Answer 6

Due to the stomachs PH

Question 7

Describe lipid digestion in small intestine

Answer 7

Lipids are hydrophobic and enter the si IN large clumps. This means that lipase can only work on the lipid surface. This is overcome by emulsification so lipids are turned into smaller droplets which is aided by bile and form micelles

Question 8

Describe the absorption of lipids

Answer 8

Products of lipid digestion are hydrophobic, so lipids associate with lecithin and bile salts to form micelles. Micelles disassociate releasing fatty acids and monoglycerides diffuse through brush border into cell. Once inside the cell chylomicrons form. These are too large to pass through capillaries, so instead drain into blood via lacteals. cChylomicrons are hydrolysed to glycerol and fatty acids making them small enough to pass through endothelia of capillaries

Question 9

Define a micelle

Answer 9

Help transport poorly soluble lipid digestion products to enterocyte, where they can be absorbed

Question 10

Define a micelle

Answer 10

Help transport poorly soluble lipid digestion products to enterocyte, where they can be absorbed

Question 11

Name the fat soluble vitamins

Answer 11

a d e k

Question 12

Name water soluble vitamins

Answer 12

b and c

Question 13

Where is the majority of the bodies water absorbed

Answer 13

small intestine