Fish Stomach Flashcards
1
Q
What kind of digestion occurs in the vertebrate stomach?
A
- acid-peptic (chemical)
2
Q
What are oxynticopeptic cells?
A
- secrete HCl and pepsinogen
3
Q
What is pepsinogen?
A
- inactive proenzyme of pepsin (when active)
4
Q
What does the fish stomach do? (4)
A
- aids digestion of protein
- breaks down cell wall/exoskeleton via acid
- acidic barrier to pathogen entry into intestine
- improves Ca and PO4 uptake
5
Q
What is the acidity of the intestine?
A
- slightly alkaline
6
Q
What are the 2 major groups of stomachs?
A
- Stomachless (agastric)
- stomach (gastric)
7
Q
What % of fish are stomachless. How?
A
- 25%
- ancestral conditions (few), mainly secondary loss
8
Q
What % of fish are gastric? What does this mainly consist of?
A
- 75%
- all elasmobranchs
9
Q
Agastric fish are commonly _____ or ____.
A
- detritivores or herbivores
10
Q
agastric fish have low quality food which means they eat in ____ ____. What is too costly?
A
- high volumes
- acidification
11
Q
Gastric fish are commonly _____. What is affective?
A
- carnivores
- acidification
