Directed Reading

Section: The Urinary System

_____ 1. What is excretion?

• a. the process of digesting food
  b. the process of breathing
  c. the process of removing waste from the body
  d. the process of adding nutrients to the body

2. What is the urinary system?

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cleaning the blood

3. What are two examples of wastes that the urinary system removes from the blood?

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the kidneys as filters

_____ 4. How many kidneys does a person normally have?
a. one
b. two
c. three
d. four

_____ 5. Which of the following is the job of the nephrons?
a. They remove wastes from the blood.
b. They produce urea.
c. They produce urine.
d. They clean the kidneys.
6. What do the kidneys do?

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7. What is urea?

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Water in, water out

_____ 8. Why do humans sweat?
a. to cleanse the skin
b. to cool the body
c. to produce saliva
d. to control thirst
9. Why does your body need to excrete as much water as it brings in?

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10. What does ADH do?

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11. What effect does a diuretic have on your body?

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urinary system problems

_____ 12. Kidney stones are made of which of the following substances?
a. viruses
b. waste materials
c. ADH
d. bacteria

13. How can bacteria get into the bladder and ureters?

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14. What can happen if the nephrons are damaged?

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