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unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure


an essential structural component of living cells and source of energy for animals


formed from fatty acids and glycerol


supply raw materials for growth and repair of structures such as muscle and skin


organic molecule that helps regulate body processes


inorganic nutrient the body needs, usually in small amounts


enzyme in saliva that breaks the chemical bonds in starches


food tube connecting the mouth to the stomach


rhythmic muscular contractions that squeeze food through the esophagus into the stomach


an enlarged and muscular saclike organ


liquid mixture of food and stomach fluids released from the stomach into the small intestine

small intestine

digestive organ in which almost all of the digestive enzymes enter the intestine and most chemical digestion takes place


gland located behind the stomach that produces hormones that regulate blood sugar; produces enzymes that break down carbohydrates, proteins, lipids, and nucleic acids; and produces sodium bicarbonate, a base that neutralizes stomach acid


Large organ just above the stomach that produces bile


folded projection that increases the surface area of the walls of the small intestine

large intestine

the last section of the digestive system, where water is absorbed from undigested material and the remaining material is eliminated from the body

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