Unit 7- Osmoregulation Flashcards
1
Q
Three homeostatic processes
A
- ionic regulation
- osmotic regulation
- nitrogen excretion
2
Q
Ionoregulators
A
- most vertebrates
- control levels of ions in extracellular fluid (ECF)
- lessens burden of ionic regulation on individual cells
3
Q
ionoconformer
A
(ancient vertebrate)
ECF approx = to sea wate r
4
Q
ICF vs ECF
A
intracellular fluid vs extracellular fluid
ICF= low Na+, high in K+, HPO4 2-, proteins
5
Q
5 obligatory exchanges of ions and water
A
- concentration gradient
- surface area: volume ration
- Permeability of integument
- Feeding, metabolic factors, excretion
- Temperature, respiration and excercise
6
Q
Concentration gradient depends on =
A
SA of animal, size of gradient, permeability of the animals surface
7
Q
SA to Volume Ratio
A
- key factor for evaporative dehydration
- for spherical animals, small size means higher ratio and faster water losses
- respiratory surface area also counts
8
Q
Permeability of Integument
A
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