7.6B Physical & Chemical Changes in Digestion
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Physical Change | A change to a substance without forming a new substance, such as changing size or state of matter.
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| Chemical Change | A change that alters the identity of a substance, resulting in a new substance or substances with different properties.
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| Cell | The basic structural and functional unit of living organisms.
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| Organ | A collection of similar tissues joined together into a structure that performs specialized functions.
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| Digestive System | The system of organs that work together to break down food into component molecules and absorb the component molecules into the body.
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| Saliva | A clear liquid that moistens the mouth and starts the digestion of food.
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| Digestive Juices | Compounds secreted into the digestive tract that break down foods into component molecules.
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| Stomach | The organ in the digestive system that churns food and mixes it with digestive juices.
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| Small Intestine | The organ in the digestive system that finishes breaking down food with digestive juices and absorbs the nutrients.
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| Nutrients | Substances that provide nourishment essential for growth and the maintenance of life.
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| Proteins | Biomolecules made of amino acids that perform biological functions.
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| Amino Acids | The molecular building blocks of proteins.
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| Lipids | One of the nutrient-providing components of food; used as an energy source in the body, and found in butter, oils, nuts, meat, fish, and some dairy products.
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| Fatty Acids | A carbon-based molecule that can store large amounts of energy; building blocks of lipids.
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| Carbohydrates | Biomolecules made of oxygen, hydrogen, and carbon that organisms use for structural support and energy storage.
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| Sugars (Glucose) | A simple molecule with stored chemical energy; the product of photosynthesis and the building blocks of the carbohydrates in our bodies and in the food we eat.
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