BIOL 260 Lecture Notes - Osmoregulation, Fluid Compartments
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Lecture - March 28th 2013
Q. In which of these fluid compartments of animals would it be the MOST important to regulate
osmolality and ion concentration?
A. Intracellular fluid: important to regulate ion and water balance in the intracellular fluid, osmotic
Strategies of osmoregulation
- When we take about strategies of osmoregulation we are typically talking about what is going on in the
blood because all organisms regulate intracellular ion concentrations and osmolality, but once we move
outside the cell they can either be:
1. Regulators – maintain internal condition through some mechanism regardless of environmental
2. Conformers – allow the osmolality of the blood to change with the environmental condition change
Q. If a shark’s blood has a lower ion concentration than does seawater, but higher osmolality, which way
will ions and water tend to move across the gills passively?
A. Both ions and water move from the sea water into the blood
(outside) high ions – low osmolality
(inside) low ions, high osmo
Know the shark rectal gland
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