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Digestive System

TermDefinition
nutrient a substance that can be used by the body to give materials for energy and for cell growth and repair
primary organ organs that break down food as food passes through them, comes into contact with the food
secondary organ pancreas,liver, gallbladder- secretes digestive juices,food does not travel through
mouth begins to break down food into smaller pieces mechanically by chewing and chemically begins digesting carbohydrates
esophagus the tube that carries food from mouth to stoamch
stomach continues the process of mechanical digestion, and secretes gastric juices that continue the process of chemical digestion started in the mouth
small intestines the organ where most of the chemical digestion of food takes place; nutrients from food are also absorbed into the bloodstream through this organ
large intestine the organ where water from the undigested food is absorbed into the bloodstream; prepares the remaining undigested food for elimination from the body
rectum a short tube that stores the solid waste until it is eliminated from the body
anus opening where the solid waste is eliminated from the body
liver produces bile, which is used by the body to break up fat, and it filters toxins from blood (secondary organ)
gallbladder stores bile produced by the liver (secondary organ)
pancreas produces digestive juices that help to further breakdown the food in the small intestine (secondary organ)
Mechanical digestion the physical breakdown of food by teeth or muscle action.
Chemical digestion the breakdown of food by body chemicals(enzymes, acids)
Enzyme a type of protein that speeds up chemical reactions in the body
6 classes of nutrients proteins,carbohydrates,fats,vitamins,minerals,water
carbohydrate sugar and starch, main source of energy
protein needed to make new cells and repair damaged cells
fats needed to make cell membrane and to insulate the body and protect internal organs
sugars found in candy jelly, table sugar fruits
starch found in bread, potatoes, pasta, cereals
proteins found in meat,eggs cheese, dried beans
organs food passes through in order mouth,esophagus,stomach,small intestine, large intestine, rectum, anus.
small intestine longer than large intestine but smaller in diameter.
pancreas produces insulin. If the pancreas is not working right, you may develop diabetes
Created by: science7th
 

 



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