Hyposmotic 



A solution that is more dilute than the comparison solution. 



Ionic regulation 



The capacity of organisms to regulate specific ion concentrations 

 in their body fluids by a selective process at the cell surface. Ionic 

 regulation is a general and primitive capacity at both cellular and 

 organismic levels. 



Isosmotic 



One solution is said to be isosmotic with another if the two are 

 equal in osmotic concentration. Although many authors use the term 

 isotonic as synonymous with isosmotic, the terms are not identical. 

 Tonicity is defined in terms of the response of cells immersed in a 

 solution. An isotonic solution is generally also isosmotic, but this 

 is not necessarily so. 



Metabolic rates 



The terms oxygen consumption rates, respiratory rates, and meta- 

 bolic rates are used synonymously. These rates are measured in a 

 variety of units. The units in most common use in static determina- 

 tions are volume of oxygen converted to standard pressure and tempera- 

 ture consumed by an animal per unit time (cc of 0_,/hr; liters of 0^/ 

 day) . In flow through respirometry, the oxygen consumption rate was 

 expressed in ml 0-/L/g. 



Nongenetic adaptations 



Involve gradual adjustments of individuals wihtin their genetic 

 limits which are directly induced by the environment and not passed 

 on as such to the next generation; as opposed to the above, genetic 

 adaptations involve changes in the genotype and are the result of 

 speciation and evolution. 



A2 



