| A | B |
|---|
| alimentary canal | digestive tube; passageway through wihich food moves from mouth to anus |
| anal pore | opening through which undigestible wastes are ejected from a paramecium |
| bile | a fluid secretion of the liver cells that aids in the breakdown of fats |
| chemical digestion | complex food molecules are chemically changed into simpler molecules |
| crop | in birds and many invertebrates, a thin-walled organ that temporarily stores food form the esophagus |
| digestion | the breakdown of complex food materials into simpler forms that an organism can use |
| gizzard | in birds and many invertebrates, a thick-walled grinding organ that crushes food released from the crop |
| ingestion | the taking in of food from the environment |
| mechanical digestion | physical breakdown of food into smaller pieces |
| oral groove | the opening in the paramecius through which food is ingested |
| ulcer | open, painful sore in the stomach lining |
| pepsin | a protein-digesting enzyme in gastric juice |
| peristalsis | the alternate waves of contraction and relaxation in the walls of the alimentary canal |
| chyme | the thin, soupy liquid produced from food by the stomach |
| egestion | removal of undigestible wastes |
| digestive enzymes | protein catalysts necessary for digestion of foods |
