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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 |