Exchange Surfaces

• Villi


  Finger-like projections on the inner wall of the small intestine that increase the surface area for absorption
• Root hair cells


  Increase the surface area of plant roots for absorption
• Surface area to volume ratio is the reason large organisms are made of many small cells, and why cells are so small
• Large organisms need exchange surfaces to increase surface area above just having many, tiny cells - makes exchange of substances much more efficient