Nutrient Digestion and Absorption (Fat and Vitamins) Flashcards Preview

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Flashcards in Nutrient Digestion and Absorption (Fat and Vitamins) Deck (18):
1

What is lipase?

Water soluble enzyme

2

What are the components of triglycerides?

1 glycerol : 3 fatty acids

3

What is emulsification?

Division of large lipid droplets into smaller droplets, speeding up digestion

4

What are the components of micelles?

Bile salt + fatty acids + phospholipids + monogylcerides

5

What is the orientation of molecules within the micelle?

Polar portions at micelle surface, non-polar portions from micelle core

6

What occurs when micelles breakdown?

Free fatty acids and monoglycerides are released into solution and diffuse across the plasma membrane of absorbing cells

7

What occurs after the free molecules from the micelle enter cells?

Enter smooth endoplasmic reticulum and are reformed into triglycerides
Processed through golgi apparatus
Exocytosed into extracellular fluid

8

What are extracellular fat droplets called?

Chylomicrons

9

What do chylomicrons contain?

Phospholipids
Cholesterol
Fat soluble vitamins

10

How are chylomicrons transported?

Lacteals between endothelial cells

11

What are the fat soluble vitamins?

Vitamins A, D, E, K

12

What are the water soluble vitamins?

Vitamins B, C and folic acid

13

What is caused by B12 deficiency?

Pernicious anaemia

14

How is iron transported?

Moves across brush border membrane into duodenal enterocytes

15

How is unbound iron transported?

Moves through serial membrane into the blood

16

What is the cause if hyperaemia?

Increased ferritin levels, more iron bound in enterocytes

17

What is the cause of anaemia?

Decreased ferritin levels, more iron released to the blood

18

Why is it important that iron is bound to ferritin?

Iron can react with oxygen, creating free radicals