Discuss the contrasting osmotic problems faced by freshwater and marine teleost fish, and the mechanism by which these fish address these problems in order to remain in osmotic balance.
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Discuss the contrasting osmotic problems faced by freshwater and marine teleost fish, and the mechanism by which these fish address these problems in order to remain in osmotic balance.
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- Describe the physiological challenges confronting marine inverte-brates entering freshwater and, using crustaceans as an example, suggest solutions to these challenges.Discuss osmotic balance in freshwater and saltwater fishes.What are the osmotic challenges faced by marine animals like fish? Describe how they cope with these challenges to maintain solute and water balance in their tissues.
- Compare the osmotic problem and the mechanism of osmotic regula-tion in freshwater and marine bony fishes.a) The process by which salmon maintain an internal balance is called osmoregulation. Describe how salmon achieve osmoregulation as they migrate between fresh and saltwater environments. b) Describe what happens to salmon in fresh water. What direction do solutes tend to move via diffusion? What direction does water tend to move via osmosis?Compare the osmoregulatory problems and adaptations of a hypo-osmotic shallow marine fish, a hyperosmotic freshwater fish, a deep-sea fish, a salmon, and a terrestrial vertebrate
- Organisms in terrestrial and aquatic habitats lose water through several mechanisms. Some of these mechanisms are habitat and organism specific. Name one mechanism of water loss that occurs only in hypoosmotic organisms:Young downstream salmon migrants moving from their freshwater natal streams into the sea leave an environment nearly free of salt to enter one containing three times as much salt as their body fluids. Describe osmotic challenges of each environment and suggest phys-iological adjustments salmon must make in moving from freshwater to the sea1) How do the plasma osmolarity and sodium concentrations of the body fluids in hagfish compare to that of teleosts and lamprey? A) Both are much lower in hagfish B) Both are much higher in hagfish C) Hagfish have a similar plasma osmolarity to teleosts and lamprey but a much lower sodium concentration. D) Hagfish have a similar Na+ concentration in their plasma to teleosts and lamprey but a much greater plasma osmolarity overall.
- A marine invertebrate such as the anemone is described as an 1.) Osmoregulator 2.) Osmomanipulator 3.) Osmoconformer 4.) Osmosupressor 5.) OsmodictatorHow do the plasma osmolarity and sodium concentrations of the body fluids in hagfish compare to that of teleosts and lamprey? Both are much lower in hagfish Both are much higher in hagfish Hagfish have a similar plasma osmolarity to teleosts and lamprey but a much lower sodium concentration. Hagfish have a similar Na+ concentration in their plasma to teleosts and lamprey but a much greater plasma osmolarity overall.A marine shark is best described as... A. A hypo-ionic, hypo-osmotic ammonotele B. A hypo-ionic, ureotelic osmoconformer C. An ammonotelic iono- and osmoconformer D. A uricotelic hyperionic, hyperosmotic regulator E. None of the above