13.14 Physiology: Digestion and absorption Flashcards
1
Q
Which carbohydrates are disaccharides?
A
Lactose, sucrose
2
Q
Which carbohydrates are monosaccharides?
A
Glucose, fructose
3
Q
What does a-amylase do (and where)?
A
Hydrolyses 1:4a linkages between glucose (mouth, duodenum)
4
Q
What stimulates secretion of a-amylase (and where from)?
A
Pancreatic a-amylase secreted due to CCK’s release from duodenal mucosa
5
Q
Where does the remainder of digestion happen?
A
Brush border of mucosal enterocytes
6
Q
How is fructose transported?
A
GLUT5 (facilitated diffusion down concentration gradient) into epithelial cells and by GLUT
7
Q
How is protein broken down?
A
By pepsin (activated by acid) in stomach
8
Q
How are peptides broken down?
A
Trypsin (and other endopeptidases)
9
Q
How are fats broken down?
A
Lipase (activated by colipase), and bile salts (emulsification)
