Here are the simplest meanings for each of the word lists:
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Polysaccharides: Large carbohydrates made of many sugar molecules linked together (e.g., starch, cellulose).
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Roughage: Dietary fiber from plant foods that aids digestion and helps keep the intestines healthy.
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Cellulose: A type of polysaccharide found in plant cell walls; it's not digestible by humans but important for dietary fiber.
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Pectin substance: A natural carbohydrate found in fruits; used as a thickening agent in foods and helps with digestion.
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Small intestine: A part of the digestive system where most nutrient absorption occurs after food leaves the stomach.
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Gastrointestinal tract: The system of organs (stomach and intestines) that digest food and absorb nutrients.
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Starch: A type of carbohydrate made of many glucose units; it's a main source of energy in many foods.
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Monosaccharide: The simplest form of sugar; a single sugar molecule (e.g., glucose, fructose).