BIOL10004 Lecture Notes - Lecture 19: Osmotic Concentration, Fluid Compartments, Reabsorption
30 Jul 2018
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Document Summary
Role of physiological systems regulate aspects of extracellular environment. Intracellular fluid separated from surroundings by plasma membrane. Mostly occur with molecules dissolved in water. Intracellular concentrations of various ions & biochemical maintained differently from extracellular concentrations. Cells must retain sufficient water so concentration of solutes are not too high or too low. Constancy of seawater environment (osmotic concentration, ion concentrations, temp, gases, ph) do not require homeostatic surroundings mechanisms but conform to environment. Allow osmotic concentration of extracellular fluids = concentration of. Stenohaline live in environment where salinity changes little (cannot. Regulate concentration of extracellular fluids at higher or lower value than that of water. Euryhaline- can tolerate a wide range of salinities. In osmotic balance with environment no water exchange across skin or gills low rate of water intake (eating & drinking) and loss (excretion) Body fluid hypotonic to sea water. Gain water drinking seawater seawater contains lots of ions. Not enough water too much salt.
