BIO2242 Lecture Notes - Lecture 11: Coelom, Teleost, Blood Plasma

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30 May 2018

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EXCRETION

All animals have waste products that must be removed from the body

• Hypotonic: lower solute concentration outside cell; water moves into cell -> explodes

• Hypertonic: higher solute concentration outside of cell; cell loses water -> shrinks

• Blood plasmas in direct connection with tissue fluids (leaky), there is exchange between blood

plasma, coelomic fluid and urea

• Marine fish are hypoosmotic; tend to lose water by osmosis and gain salt

-Get rid of most of their salt through gills

eg. Teleost have very thin gill membrane, cells are actively transporting Cl out to seawater, Na

follows Cl (due to polarity, it follows the negative charge of the chloride

•

• Freshwater fish are hyperosmotic; tendency to gain water and lose salts

• Salmon can deal with both marine and freshwater.

They igrate up freshwater ad ak to sea. Whe they’re i seawater Na rises whih auses a

immediate reaction -> releases the hormone cortisol -> activates NaK pumps in gills -> gets rid of

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