6.10 absorption of products of digestion

Question 1

describe the 3 steps of co-transport of amino acids & glucose.

Answer 1

1- Na+ ions transported from epithelial cell to blood through active transport -> low Na+ concentration in epithelial cell

2- Na+ ions diffuse in through co-transport protein & brings glucose & amino acids into epithelial cells

3- glucose & amino acids passes into the blood plasma by facilitated diffusion

Question 2

how are micelles formed?

Answer 2

emulsification through bile salts (which is produced in the liver)

Question 3

what’s the advantage of splitting triglycerides into micelles?

Answer 3

increases SA -> quicker speed of action

Question 4

describe the process of absorption of triglycerides.

Answer 4

1- lipids hydrolysed by lipases
2- split into micelles
3- micelles break down in contact with epithelial cells
4- monoglycerides & fatty acids transported to the ER
5- triglycerides are modified & forms chylomicrons
6 chylomicrons move out to lacteals through exocytosis

Question 5

where are monoglycerides & fatty acids recombined?

Answer 5

ER

Question 6

what are triglycerides modified & associated with?

Answer 6

cholesterol & lipoproteins -> forms chylomicrons