Erstellt von J yadonknow
vor mehr als 6 Jahre
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Frage | Antworten |
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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