intestine Flashcards
1
Q
The intestine is a site of ____ and _____.
A
- digestion and absorption
2
Q
What is important for absorption? What contributes to this?
A
- SA
- microvilli and folding of mucosa
3
Q
What are microvilli?
A
- apical projections at subcellular level
4
Q
What enzymes are used for proteins?
A
- proteases (tripsin + chytotripsin)
5
Q
What enzymes are used for carbohydrates?
A
- amylases
6
Q
What enzymes are used for lipids?
A
- lipase
7
Q
What enzymes are used for RNA?
A
- RNases
8
Q
What enzymes are used for DNA?
A
DNases
9
Q
What do fish intestines lack compared to mammals? what do they have instead?
A
- lack intestinal villi (have folding)
- lack glands
10
Q
What is relative intestinal length?
A
- intestine length : body length
11
Q
What species has a high RIL?
A
- species consuming detritus, algae (lots of indigestible matter)
12
Q
What does higher RIL mean?
A
- increased capacity*volume
- increased SA
- increased digestion time
13
Q
What are 2 ways to increase SA without increasing length of intestine?
A
- pyloric cecae
- spiral intestine
14
Q
What is pyloric cecae?
A
- blind end sacs just after stomach
15
Q
What is a spiral intestine?
A
- spiral fold in limited space (compact)
- slows movement of food
- increases time for digestion
