Chapter 14: Using Food and Staying FIt

7 terms by riepointer 

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digestion

the process of breaking food down into simpler substances for the body to use

enzyme

a substance in a living thing that affects how fast chemical reactions take place

bile

a greenish yellow fluid produced by the liver to digest fats

villus

a tiny finger like projection in the small intestine that absorbs digested food

urea

a substance formed from waste material in the liver and excreted in urine

excretion

the process of removing waste products from the body

nephron

a structure in the kidney that filters blood

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