Term
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Definition
| maintaining steady state equilibrium in the internal environment of an organism |
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Term
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Definition
| maintaining equilibrium with respect to solute (ionic and neutral solutes) concentrations |
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Term
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Definition
| maintaining equilibrium with respect to the amount of water retained in the body fluids and tissues |
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Term
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Definition
| passage of a fluid through a semipermeable membrane from the less to more concentrated side |
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Term
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Definition
| one that allows the solvent, but not the solute to pass through |
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Term
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Definition
| passage of solute through a membrane from a state of higher concentration to lower concentration |
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Term
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Definition
| regulation of their own internal environment within a narrow range, even if outside conditions vary |
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Term
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Definition
| fishes capable of tolerating a small range in salinities |
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Term
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Definition
| fishes capable of osmoregulating over a wide salinity range |
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Term
Give an example of each:
Isosmotic
hyperosmotic
hyposmotic |
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Definition
1. osmoconformers-hagfish
2. Freshwater fish- Lampreys
3. Saltwater fish |
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Term
| How do hyperosmotic fish osmoregulate |
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Definition
problem: constant water gain and ion loss with skin and gills very permeable to water
solution: excrete lots of urine
salts gained back by: -food intak -absorption of water by the kidneys -actively removed at gills by chloride cells |
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Term
| How do hyposmotic fish osmoreguate |
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Definition
problem: constant water loss!
Solution: swallow water and absorb via gut
chloride excreted by chloride cells in gut |
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