Zusammenfassung der Ressource
The Alveoli-
Efficiency of Gas
Exchange
- Alveoli provide a large surface are for
Gas Exchange
- The spherical shape of each alveoli
provides a large SA:VOL ratio for
diffusion
- The walls of alveoli and surrounding
blood capilaries are in close contact
- This provides a short diffusion
pathway for gas exchange
- The walls of alveoli and
capilaries are ine cell
thick
- Therfore, Short diffusion
pathway
- Steep conc. gradient maintained
between blood and alveous air to allow
continuous gas exchange
- There is a most lining for
gases to dissolve in