BIO 203 Lecture Notes - Lecture 5: Osteichthyes, Osmoregulation, Elasmobranchii
7 Aug 2018
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Document Summary
When we"re talking about how organisms interact with the envi, for water and ion balance, we"re going to be very concerned with the body fluid osmotic concentration. In order for an organism to be at homeostasis the ecf has to = icf: if not, cell volume will change, not good for most cells. Three basic possibilities: an organism can have the same osmolarity as the environment, if that"s the case, the organism would be living on the blue line and are. **the frame of reference is from the perspective of the organism. Osmoregulator: an animal that maintains a stable bfoc despite osmotic stress. Osmoconformer: an animal whose bfoc tracks environmental osmotic concentration. Eurhyaline: an animal that can survive over a wide range of environmental concentrations. Stenohaline: an animal that can tolerate only a limited range of environmental osmotic concentrations. Osmoconformer: we can divide them into ionoconformers or ionoregulators.
