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7 terms

Chapter 14: Using Food and Staying FIt

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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