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Changes in Digestion

7.6B Physical & Chemical Changes in Digestion

TermDefinition
Physical Change A change to a substance without forming a new substance, such as changing size or state of matter.
Chemical Change A change that alters the identity of a substance, resulting in a new substance or substances with different properties.
Cell The basic structural and functional unit of living organisms.
Organ A collection of similar tissues joined together into a structure that performs specialized functions.
Digestive System The system of organs that work together to break down food into component molecules and absorb the component molecules into the body.
Saliva A clear liquid that moistens the mouth and starts the digestion of food.
Digestive Juices Compounds secreted into the digestive tract that break down foods into component molecules.
Stomach The organ in the digestive system that churns food and mixes it with digestive juices.
Small Intestine The organ in the digestive system that finishes breaking down food with digestive juices and absorbs the nutrients.
Nutrients Substances that provide nourishment essential for growth and the maintenance of life.
Proteins Biomolecules made of amino acids that perform biological functions.
Amino Acids The molecular building blocks of proteins.
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.
Fatty Acids A carbon-based molecule that can store large amounts of energy; building blocks of lipids.
Carbohydrates Biomolecules made of oxygen, hydrogen, and carbon that organisms use for structural support and energy storage.
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.