Many small alveoli give the lungs a large surface area for the diffusion of oxygen and carbon dioxide. A good blood supply helps to maintain a large concentration gradient
Mammalian small intestines
Villi and microvilli give the inner surface of the small intestine a large surface area for the diffusion of the products of digestion. A good blood supply helps to maintain a large concentration gradient
Fish gills
Have a large surface area for the diffusion of oxygen and carbon dioxide
Plant roots
root hair cells have long hairs that increase the surface area for the movement of water
Plant leaves
have large air spaces inside the leaf and many holes (stomata) on the underside of the leaf, for the diffusion of carbon dioxide and oxygen
