Lipid Digestion & Absorption

Question 1

Where is lipase produced?

Answer 1

= pancreas
= hydrolyses ester bonds in triglycerides
= forms monoglycierdes and fatty acids

Question 2

What are bile salts?

Answer 2

= formed in liver
= emulsify lipids- forms tiny droplets micelles
= increases syrface area for lipase

Question 3

What is a micelle?

Answer 3

= vesicle containing:
= fatty acids
= glyceroel
= monoglycerides
= bile salts

Question 4

How do micelles help with lipid absorboptuon?

Answer 4

= make fatty acids (non-polar), more soluable in water
= carry the fatty acids to epithelial cells of the lumen of the illuem
= maintains a high concenreation of fatty acids- groups fatty acids together
= fatty acids are released from the micelle and enter epithelial cells by simple diffusion

Question 5

Why do fatty acids enter by simple diffusion?

Answer 5

= non-polar lipid soluable
= dissolce abd diffuse through phosphollipid bilaer
=

Question 6

What happens once lipids are in the cell what happens?

Answer 6

= fatty acids + monoglycerides
= modified back into triglycerides
= inside endoplasmatic recticulm
= or golgi apparatus- if protein is added make chylomicron

Question 7

How do modified lipids leave the epithelial cells?

Answer 7

= vesicles containing the troglycertide are released and move towards cell membrane
= fuse will cell mebrane and releaed by exocytosis
= enter lacteal and transpirted around