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Functions of the Respiratory System
  
DIgestive Tract Model Chart (9)by GreenFlames09 on Flickr

1. The Nose-
  • Draws air in through the nostrils to the pharynx.
2. Pharynx-
  • The throat.
  • Connects the nose to the larynx.
3. Larynx
  • Voice box
  • connects pharynx to trachea.
4. Trachea
  • Windpipe
  • Connects larynx to the bronchus.
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cartilageby jetheriot on Flickr

5. Bronchi
  • Main tubes run from trachea to bronchioles.
6. Bronchioles
  • Lead into lungs.
  • Made of smooth muscle.

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Normal lung: Alveoliby Pulmonary Pathology on Flickr

7. Alveoli
  • Air sacs in the lungs.
  • Where gas exchange takes place.
  • Smallest part of the respiratory system.
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lung illustrationby Joe Crawford (artlung) on Flickr

Lungs
  • The largest, most important organs in respiration and ventilation.
  • The right lung has three lobes and the left lung only has two.
  • The heart tucks in between the two lungs and into the left lung.
  • The diaphragm (not pictured), is a structure located beneath the lungs.  The major function of the diaphragm is assisting with breathing.
  • When breathing, the diaphragm will move.  During inspiration, the diaphragm moves downward and the lungs expand, filling with oxygen. During expiration, the diaphragm moves upward to a normal position, and carbon dioxide is forced out of the lungs.
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