13048788
Description
Flashcards by J yadonknow, updated more than 1 year ago
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Created by J yadonknow
over 6 years ago
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| Question | Answer |
| Osmoregulation | Maintenance of constant/near constant blood plasma OSP |
| Osmoconformer | Follow isosmotic line by matching blood OSP to enviro OSP |
| Ionic regulation | Ionoregulators ionoconformers |
| Volume regulation | self explanatory |
| FW crab kidneys (4) | 1. Regulate volume only 2. water by osmosis = urine excreted 3. Haemolymph isotonic w urine 4. Haemolymph hyperosmotic to water |
| What is a hyperosmotic regulator? | All FW animals BOP is hyper to H2O |
| What challenges to FW fish face? | Volume reg - H2O constantly enters body from dilute enviro. Osmotic reg - Entering H2O lowers the ECF OSP Ionic reg - Ions move from ECF to more dilute surrounding water Entering water also dilutes the ECF |
| What are FW gills comprised of? | 90% Pavement cells for O2 uptake MRC cells which are Cl- channels, ion channels |
| What compromise must gills make? | If more MRC then less O2 uptake |
| How do marine fish gain water? | Integuments and epithelia of marine fish are poorly penetrated by SW Drink SW, co-absorbed in gut epithelia with monovalent ions |
| What problem does this pose? | Upsets ionic regulation |
| How do marine fish excrete waste? | Divalent ions from kidneys Na+/Cl-/nitro. waste from gills |
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