3. Physiology
        3.13. Respiratory
            3.13.6. Others
3.13.6.3. 20041229

Lung structure

 

300 million alveoli, 1/3mm in diameter => 50-100 m2 surface area

 

Z0 - Trachea

Z1 - Bronchi

Z4 - Bronchioles

Z16 - Terminal bronchioles

Z17-19 - Respiratory bronchioles

Z20-22 - Alveolar ducts

Z23 - Alveolar sac

 

Z0 to Z16 - Conducting airway

Z17 to Z23 - Transitional and respiratory zone

 

Alveolar are polyhedral, not spherical, and not all surface areas are available for gas exchnge.

=> Total surface area can only be estimated.

 



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