In the digestive system, the small intestine has cells that are adapted to ____ diffusion. The small intestine have projections called ____. These provide a ____ surface area. This allows ____ molecules to cross into the blood at once. The villi have ____ walls. This provides a ____ diffusion distance for molecules to cross. The villi have a large network of ____ vessels which creates a ____ difference in concentration between the small intestine and the blood. These features are also seen in other organs that rely on diffusion - such as air sacs (called alveoli) in our ____.

Speeding up diffusion - digestive system

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