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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