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Lesson 3+4

Science Test

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