have large surface area/spherical shaped
numerous/many to increase surface area
one cell thick
moist surface for air to diffuse
highly vascularised/numerous capillaries
OR
State adaptations of alveoli for gaseous exchange.
Are numerous to increase surface area for absorption of gases.
Have thin epithelium to allow ease of diffusion of gases.
Inner surface has a moisture lining to allow gases to dissolve.
Is richly supplied with blood to carry gases and maintain a concentration gradient.
Presence of surfactant to reduce surface tension and allow for gaseous exchange.
Mohaissack answered the question on October 5, 2017 at 12:08
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