Respiratory System

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Respiratory System Powered By Docstoc
					Respiratory
  System
       Air Traffic Control
1.   Air enters mouth or nose
2.   Pharynx
3.   Epiglottis
4.   Trachea
5.   Bronchi
6.   Bronchiole
7.   Alveoli
       Keeping It Clean
Nose hair
Cilia
Mucus

* Cilia can be killed by smoking*
         Gas Exchange
• Alveoli have thin walls
• Capillary mesh around each
  alveolus
• Diffusion of oxygen and CO2 to
  and from blood stream
           Transport
• RBC – red blood cells
• RBCs contain hemoglobin which
  contains iron
• Iron attracts and holds oxygen
             Control
• Controlled by medulla oblongata
• Diaphragm pulls down, lungs
  expand

***No vacuum, no breathing***

				
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posted:7/27/2012
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