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Lesson 3+4
Science Test
| Term | Definition |
|---|---|
| digestion | The process that breaks down complex molecules of food into smaller nutrient molecules |
| absorption | The process by which nutrient molecules pass through the wall of the digestive system into the blood |
| saliva | The fluid released from glands in the mouth that plays an important role in both mechanical and chemical digestion |
| enzyme | A type of protein that speeds up a chemical reaction in a living thing |
| epiglottis | A flap of tissue that seals off the windpipe and prevents food from entering the lungs |
| mucus | A thick, slippery substance produced by the body |
| peristalsis | Waves of smooth muscle contractions that move food through the esophagus toward the stomach |
| bile | A substance produced by the liver that breaks up fat particles |
| 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 |
Created by:
cassie35915
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