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CHAPTER
39
RESPIRATION, CIRCULATION, AND EXCRETION
Get the Big Picture
Read the paragraphs in the boxes. Then answer the questions.
The respiratory system, the circulatory system, and the urinary system are very
important for maintaining homeostasis—your body’s constant internal environment.
The respiratory system breathes in oxygen and takes it into the body. It also breathes out
waste carbon dioxide.
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The circulatory system delivers oxygen from the respiratory system and nutrients from
digestion to your body’s tissues. It also picks up waste products, such as carbon dioxide, from
tissues and carries them out of the body. Carbon dioxide goes out through the respiratory
system, other wastes exit through the urinary system.
Finally, the urinary system removes waste products from your blood through the
kidneys—two small, but powerful, filters.
circulatory and respiratory
1. Which two systems carry carbon dioxide out of the body? ________________________________
__________________________________________________________________________________
circulatory and urinary
2. Which two systems carry the waste products out of the body? ____________________________
__________________________________________________________________________________
3. Which two gases does your respiratory system breathe in and breathe out? _________________
oxygen and carbon dioxide
__________________________________________________________________________________
circulatory
4. Which system delivers nutrients throughout your body? _________________________________
homeostasis
5. What do the three main systems of your body maintain? _________________________________
BIOLOGY: The Dynamics of Life CHAPTER 39
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