The Digestive System: Small Intestine
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When food reaches the small intestine, bile from the gall bladder and enzymes help make the food molecules small enough to be absorbed. The wrinkles in the small intestine increase the surface area... (more info)

When food reaches the small intestine, bile from the gall bladder and enzymes help make the food molecules small enough to be absorbed. The wrinkles in the small intestine increase the surface area of absorption.

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