digestive system Flashcards
1
Q
what does the small intestine have?
A
selectively permeable membrane
2
Q
what does it mean by selecitvely permeable membrane in the small intestine?
A
only small molecules can pass through to the blood and not large
3
Q
what are large molecules?
A
- starch
- protein
- fats
4
Q
what are small molecules?
A
- sugars (maltose)
- amino acids
- fatty acids and glycerol
5
Q
what is starch broken into?
A
sugars (maltose)
6
Q
what is protein broken into?
A
amino acids
7
Q
what is fat broken into?
A
fatty acids and glycerol
8
Q
what is the role of the small intestine?
A
absorbs nutrients into the blood via the large numbers of villi
9
Q
what are features of the small intestine that increase efficiency of absorption?
A
- large numbers of villi
- thin wall
- large surface area
- extensive blood supply
10
Q
what does the lacteal absorb?
A
fatty acid and glycerol
11
Q
what does the blood capillary absorb?
A
glucose and amino acids
