Question

What are Osmoregulators

Answer 1

 the  animals  that  maintain  internal  osmolarity,  different  from  the  surrounding  medium  in which  they  inhabit.  Many  aquatic  invertebrates  are  strict  or  limited  osmoregulators.  Most  vertebrates  are strict  osmoregulators,  i.e.  they  maintain  the  composition  of  the  body  fluids  within  a  narrow  osmotic  range. The notable  exception,  however, are the  hagfish  (Myxine  sp.,  a marine cyclostome fish)  and elasmobranch fish  (sharks  and  rays). Osmoregulators  must  either eliminate  excess  water  if  they are  in  hypotonic  medium  or  continuously take  in water  to  compensate  for  water  loss  if  they are  in  a  hypertonic  situation.  Therefore,  osmoregulators  have  to spent  energy to move water in or out and maintain osmotic gradients  by manipulating solute  concentrations in their  body fluids.

Answer 2

Osmoregulation, in biology, maintenance by an organism of an internal balance between water and dissolved materials regardless of environmental conditions. In many marine organisms osmosis (the passage of solvent through a semipermeable membrane) occurs without any need for regulatory mechanisms because the cells have the same osmotic pressure as the sea. Other organisms, however, must actively take on, conserve, or excrete water or salts in order to maintain their internal water-mineral content.

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