Lecture 10

Question 1

Digestion converts ingested materials into

Answer 1

molecules small enough for absorption

Question 2

Absorption occurs through

Answer 2

Active transport, simple diffusion, facilitated diffusion, secondary active transport, & endocytosis

Question 3

Monomers of carbohydrates, proteins, and nucleic acids are absorbed via

Answer 3

blood capillaries

Question 4

Monomers of lipids are absorbed through

Answer 4

lacteals (lymphatic systems)

Question 5

uptake of glucose or galactose

Answer 5

SGLT1 is the Na+-coupled transporter that mediates the uptake of glucose or galactose from the lumen of the small intestine into the enterocyte.

Question 6

fructose diffusion

Answer 6

GLUT5 mediates the facilitated diffusion of fructose into the enterocyte.

Question 7

Enterocyte

Answer 7

= Villie –> brush border –> enterocyte

Question 8

Once the monosaccharides are inside the enterocyte,

Answer 8

GLUT2 mediates their efflux across the basolateral membrane into the interstitial space.

Question 9

The 3 monosaccharides (i) glucose, (ii) galactose, & (iii) fructose, are absorbed by the small intestine in a 2-step process

Answer 9

[uptake across the apical membrane into the epithelial cell], &
[coordinated exit across the basolateral membrane]

Question 10

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