Homeostasis: Osmoregulation in elasmobranchs. The difference between marine, eurahyline and fresh water species. Osmoregulation. Relationship between solute to solvent concentrations of internal body fluids The environment the organism lives in Isotonic? Hypertonic? Hypotonic?.
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Endocrine Regulation to Regulate Body Fluid Volume and Solute Concentration
CNP - Released from heart
Increase urine production
Stimulate salt secretion from rectal gland
Inhibit drinking and relax blood vessels
Increase in plasma osmolality
Reduces urine production
Antagonistic to CNP, reduces urine flow
Constricts blood vessels
Feeding and osmoregulation
Urea is metabolically expensive
5 umol ATP for 1 mole urea
Protein in food is main source of N in urea
Elasmobranches must get adequate food to produce the urea
Why ureotelic and not ammonotelic???
Hammerschlag N.2006. Osmoregulation in elasmobranches: a review for fish biologists, behaviorists and ecologists.MARINE AND FRESHWATER BEHAVIOUR AND PHYSIOLOGY 39 (3): 209-228
Speers-Roesch B, Ip YK, Ballantyne JS.2006. Metabolic organization of freshwater, euryhaline, and marine elasmobraches: implications for the evolution of energy metabolism insharks andrays. JOURNAL OF EXPERIMENTAL BIOLOGY 209 (13): 2495- 2508
Pillans RD, Anderson WG, Good JP, et al.2006. Plasma and erythrocyte solute properties of juvenile bull sharks, Carcharhinus leucas, acutely exposed to increasing environmental salinity. JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY 331 (2): 145-157
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