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substances in food that provide the raw materials and energy the body needs to live


the amount of energy needed to raise the temperature of one gram of water by one degree Celsius


a nutrient that is composed of hydrogen, carbon, and oxygen, and are a major source of energy


a sugar that is the major source of energy for a cell


a nutrient composed of carbon, hydrogen, and oxygen forms the cell membrane and is used as insulation in our bodies


a nutrient that contains nitrogen as well as carbon, hydrogen, and oxygen and is used for tissue repair and growth in the body.

Amino Acid

the building blocks of proteins

Nucleic Acid

very large organic molecule that contains the instructions cells need to carry out all the functions of life.


building block of DNA and RNA


act as helper molecules in a variety of chemical reactions in the body


nutrient that is not made by living things


the most important nutrient in the body because all chemical reactions take place in this substance


the process by which the body breaks down food into small nutrient molecules


the process by which nutrients pass through the wall of your digestion system into the blood


both mechanical and chemical digestion begin here


a liquid made in your mouth that helps both mechanical and chemical digestion


proteins that speed up chemical reactions in the body


a flap of tissue that seals off your windpipe when you swallow.


a muscular tube that connects the mouth to the stomach


a thick, slippery substance that makes food easier to swallow and move through our digestive system


involuntary muscle contractions in the digestive system that help move food through the system


a muscular pouch in which most mechanical digestion occurs

Small Intestine

the longest part of your digestive system where most chemical digestion takes place


the largest organ in the human body that produces bile for digestion


a substance produced by the liver that breaks up fat particles

Gall Bladder

an organ that job is to store bile


an organ that produces many enzymes to break down starches, proteins, and fats


tiny finger-like projections in the small intestine that absorb nutrient molecules

Large Intestine

an organ that functions to absorb water from digested food


an organ that compresses and stores solid waste


the muscular opening at the end of the rectum through which waste is eliminated from the body

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