| A | B |
|---|
| small intestine | The part of the digestive system in which most chemical digestion takes place. |
| liver | The largest and heaviest organ inside the body; it breaks down substances and eliminates nitrogen from the body. |
| bile | A substance produced by the liver that breaks up fat particles. |
| gallbladder | The organ that stores bile after it is produced by the liver. |
| pancreas | A triangular organ that produces enzymes that flow into the small intestine. |
| villi | Tiny finger-shaped structures that cover the inner surface of the small intestine and provide a large surface area through which digested food is absorbed. |
| large intestine | The last section of the digestive system, where water is absorbed from food and the remaining material is eliminated from the body. |
| rectum | A short tube at the end of the large intestine where waste material is compressed into a solid form before being eliminated. |
| anus | A muscular opening at the end of the rectum through which digestive waste material is eliminated from the body. |
