SI worksheet 18 answers - Osmoregularity and mammalian...

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Osmoregularity and mammalian reproduction Osmoconformers are animals that _____. a. expend considerable energy in matching concentrations of their body fluids with those of their marine environment b. rely on the digestive, respiratory, and excretory systems to remove excess salts and water from their bodies c. have an internal environment isoosmotic with their external environment d. spontaneously absorb water through the body surface and lose solutes in urine e. spontaneously lose water through body surfaces and must actively unload ions and drink water to maintain osmotic homeostasis Why do freshwater fish excrete a large amount of very dilute urine? a. Because they live in a hypoosmotic solution, their cells take up excess water that must be excreted. b. Because they live in a hypoosmotic solution, their cells tend to accumulate a lot of solute that must be excreted. c. Because they live in a hyperosmotic solution, their cells take up an excess of water that must be excreted. d. Because they live in a hyperosmotic solution, their cells tend to accumulate a lot of solute that must be excreted. e. Because animals must live in an isoosmotic solution, they excrete solutes to make the concentration of solutes in the water equal to the concentration of solutes in their cells.
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