5.5 Flashcards
1
Q
absorption of water soluble vitamins occurs via
A
Na+- dependent cotransport
small intestine
2
Q
absorption of B12 requies
A
Intrinsic factors (released from Parietal cells)
3
Q
first step of vit B12 absorption
A
vit B12 is released from food by the digestive action of Pepsin in stomach
4
Q
second step of vit B12 absorption
A
free vit B12 binds R proteins
5
Q
where does the R protein come from?
A
the salivary jucies
6
Q
third step of vit B12 absorption
A
in duodenum, pancreatic protease degrade R protein -> vit B12 transfered to IF
7
Q
fourth step of vit B12 absorption
A
vit B12- IF complex travels to ilium -> being absorbed
