Homework3key_000FA07

Homework3key_000FA07 - BILD 2 Homework #3 11/9/07 How does...

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BILD 2 Homework #3 11/9/07 1A) What problems with osmoregulation does a freshwater fish have? How does it cope with these problems? It tends to lose solutes to its surrounding, because solutes in its body are more concentrated than solutes in its surroundings. Because it is hyperosmotic to fresh water, the fish also tends to gain water. The freshwater fish must actively transport salts into its body through its gills, and offload excess water by excreting lots of dilute urine. See Fig. 44.3. 1B) What problems with osmoregulation does a saltwater fish have? How does it cope with these problems? Because salts are more concentrated outside the fish than inside it, the fish will tend to gain salt (and also it takes them in through the water it must drink). Since it’s body is hypoosmotic to sea water, it will tend to lose water to its surroundings. The fish can counteract these tendencies by drinking water to offset osmotic water loss, and by actively transporting salts out of its gills to offset salt gain. It will tend to excrete small amounts of urine, minimizing water loss. See Fig. 44.3. 2) What are the three main forms in which nitrogenous wastes are excreted by animals? What are the adaptive advantages and disadvantages of each? See Fig. 44.8.
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This note was uploaded on 03/22/2009 for the course BILD BILD 2 taught by Professor Schroeder during the Spring '08 term at UCSD.

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Homework3key_000FA07 - BILD 2 Homework #3 11/9/07 How does...

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