013368718X_CH30_465-482.indd
Name Class Date
27.4 Excretion
The Ammonia Problem
1. Why does ammonia build up in organisms?
2. Why is ammonia a problem in the body of an animal?
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Name Class Date
3. Complete the concept map.
Ways to Store Nitrogenous Waste
Excretion in Aquatic Animals
4. How do many freshwater invertebrates rid their bodies of ammonia?
5. Describe how flatworms maintain water balance.
6. Why do freshwater fishes typically have very dilute urine and marine fishes have very concentrated urine?
Excretion in Terrestrial Animals
Terrestrial Invertebrates and Vertebrates All land animals need water to survive. Their excretory processes use up some of this water. However, most land animals have adapted ways to minimize water loss.
The Venn diagram below compares the ways terrestrial invertebrates and terrestrial vertebrates eliminate waste and conserve water. Complete the diagram using the terms below.
30.4 The Excretory System
Structures of the Excretory System
1. Why does the body need an excretory system?
2. What is excretion?
3. What waste compounds are produced by every cell in the body?
4. Complete the table about the excretory system.
|Organs of the Excretory System |
|Organ |Function |
|Skin | |
|Lungs | |
| |Converts dangerous nitrogen wastes into urea |
|Kidneys | |
| |Transport urine from kidneys to the bladder |
| |Stores urine |
|Urethra | |
The Kidneys and Homeostasis
12. Describe three ways that the kidneys help maintain homeostasis.
13. Explain how the kidneys regulate the levels of salt in the blood.
14. How does dialysis work?
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Ammonia
is converted into
by
by
insects Malpighian tubules urea waste
kidneys mammals uric acid water
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