DIGESTIVE SYSTEM

2. / Tiny finger-shaped structures that cover the inner surface of the small intestine and provide a large surface area through which digested food is absorbed.
5. Guide Pyramid / A chart that classifies foods into 6 groups to help people plan a healthy diet.
7. / The organ that stores bile after it is produced by the liver.
8. / A protein that speeds up chemical reactions in the bodies of living things.
9. / A muscular tube that connects the mouth to the stomach.
13. / Involuntary waves of muscle contraction that keep food moving along one direction through the digestive system.
15. / High energy nutrients that are composed of carbon, oxygen, and hydrogen, and contain more than twice as much energy.
16. / A waxy fatlike substance, found in only in animal products that is an important part of the body cells.
17. / The amount of energy needed to raise the temperature of 1 gram of water.
19. / Molecules that act like helpers in a variety of chemical reactions within the body.
20. Acids / Small units that are linked together chemically to form large protein molecules.

1. / Nutrients that are needed by the body in the small amounts and are not made by living things.
3. / Large organic molecules made of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur.
4. / A substance produced by the liver that breaks up fat particles.
6. / Energy-rich organic compounds, such as sugars or starches, that are made of the elements carbon, hydrogen, and oxygen.
10. / Substance in food that provide raw materials and energy.
11. / A J- shaped muscular pouch located in the abdomen that expands to hold all of the food that is swallowed.
12. / A triangular organ that produces enzymes that flow into small intestine.
14. Intestine / The part of the digestive system in which most chemical digestion takes place.
18. / The largest and heaviest organ in the body; it breaks down substances and eliminates nitrogen from the body.