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System Overview
Abdomen between pages 4 and 5 by perpetualplum on Flickr

  • Respiratory System is the system which supplies the body tissues with oxygen and gets rids of carbon dioxide. 
  • It is made up of the nasal cavity, trachea, bronchi, lungs, and diaphragm. 
  • The process of breathing in oxygen is called inhaling and breathing out carbon dioxide is called exhaling.

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From the Brockhaus and Efron Encyclopedic Dictionary by Double--M on Flickr

Nose and Nasal Cavity
  • As you inhale air though your nose, small specks of dirt are trapped by many tiny hairs in your nose called cilia, this cleans the air.
  • The hairs stop the dirt from going further in your body. 
  • The moist surface inside your nose traps even smaller pieces of dirt. 
  • The nasal cavity, the air passage behind the nose, plays an important role in breathing. 
  • The nasal cavity is divided into a right and left passageway. 
  • The tissue that covers the wall of your nasal cavity contains many blood vessels. 
  • Heat from the blood in the vessels helps warm the air as you breath. 
  • Moisture is added to the air you breath by special cells in the walls of the nasal cavity. 
  • The air is warmed and moistened before it reaches your lungs.
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cartilage by jetheriot on Flickr


  • The trachea (TRAY-kee-uh} is sometimes called the windpipe. The trachea filters the air we breathe and branches into the bronchi. 


  • The bronchi (BRAHN-ky) are two air tubes that branch off of the trachea and carry air directly into the lungs.

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