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Gas Large Surface Number Mesophyll Cells Exchange Areas

Leaves facilitate gas exchange through a large surface area provided by mesophyll cells, numerous air spaces, a film of water for gas dissolution, and thin mesophyll cell walls.

Leaves facilitate gas exchange through a large surface area provided by mesophyll cells, numerous air spaces, a film of water for gas dissolution, and thin mesophyll cell walls.

Front Gas exchange surfaces should have large surface areas, be moist and be thin. How are these conditions met in the leaf?
Back huge number of spongy/palisade mesophyll cells provide a big surface area (for gas absorption); 
large number of air spaces in contact with spongy cells; 
covered in film of water (from xylem) to dissolve gases; 
mesophyll cells have thin cellulosic walls (which are permeable to gases);

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