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23 terms

Physical/Chemical Change in Digestion

to support 7th grade TEKS
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physical change
when a substance changes its size, shape, or state. No new substance is formed
chemical change
occurs when a new substance is formed as the result of a chemical reaction
precipitate
a type of solid that is formed from a solution
digestion
the process by which the body breaks down food into small nutrient molecules
digestive system
collection of organs used to break down foods into energy and building material for the body
mechanical digestion
Part of digestion that uses movement and muscles to break down food
chemical digestion
occurs when enzymes and other chemicals break down large food molecules into smaller ones
mouth
part of the body where both chemical and mechanical digestion begins
saliva
liquid secreted into the mouth that contains mucus and digestive enzymes that start chemical digestion
molecule
units of two or more atoms held together by chemical bonds; the smallest unit of a compound
carbohydrate
organic molecules composed of two or more simple sugars linked together
esophogus
tube in which food travels from mouth to the stomach
stomach
large muscular sac that continues the mechanical and chemical digestion of food
stomach acid
solution with a pH of 1.5 to 2.0. It kills bacteria and helps digest your food
small intestine
responsible for most chemical digestion and absorption of nutrients
large intestine
the last section of the digestive system, where water is absorbed from food and the remaining material is eliminated from the body
protein
large organic molecules made up of manysmaller amino acid molecules joined together
lipid
large organic molecule used for long term storage of energy for organisms; includes fats, oils, and waxes
absorption
the process by which nutrient molecules pass through the walls of the digestive system into the blood
nutrients
the chemicals necessary for an organism to live and grow
matter
has mass and takes up space
signs of a chemical change
change in color or odor; release of heat, light, or sound; produces gas or water; formation of a precipitate
accessory organs
food does not pass through these organs, but they aid in chemical digestion by creating chemicals that help to break down food molecules; pancreas & liver