5.5

Question 1

absorption of water soluble vitamins occurs via

Answer 1

Na+- dependent cotransport

small intestine

Question 2

absorption of B12 requies

Answer 2

Intrinsic factors (released from Parietal cells)

Question 3

first step of vit B12 absorption

Answer 3

vit B12 is released from food by the digestive action of Pepsin in stomach

Question 4

second step of vit B12 absorption

Answer 4

free vit B12 binds R proteins

Question 5

where does the R protein come from?

Answer 5

the salivary jucies

Question 6

third step of vit B12 absorption

Answer 6

in duodenum, pancreatic protease degrade R protein -> vit B12 transfered to IF

Question 7

fourth step of vit B12 absorption

Answer 7

vit B12- IF complex travels to ilium -> being absorbed