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
1. This provides a short diffusion pathway for gas exchange
The walls of alveoli and capilaries are ine cell thick
1. 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

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