BSCI 207 Lecture Notes - Lecture 25: Nephron, Reabsorption, Ureter
31 Oct 2016
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Document Summary
Organisms can be either osmoregulators or osmoconformers with respect to their environment. Osmoconformers are organisms that change their osmolarity to be similar to the environment. Osmoregulators try to maintain a constant osmolarity in a changing environment. Methods of osmoregulation vary depending on the environment and organism: salt water fish osmoregulation. Typically have a lower concentration of solutes inside the fish than outside the fish. Fish is hypotonic relative to the environment. Water will be lost by the gills. Salt ions will flow into the fish through the gills: two above factors will ultimately cause dehydration. Fish must drink saltwater to stay hydrated: ions will also flow into the fish this way, can be exported by gills or kidneys. Will release small amounts of urine with a high salt concentration: fresh water fish osmoregulation. Typically have a higher concentration of solutes inside the fish than outside the fish. Fish is hypertonic relative to the environment.
