Biology

3. Measure of heat energy in food
4. Chemical substance that an organism needs to sustain life
5. Step in which the body eliminates what it does not need
10. Response that blocks further actions of a stimulus
13. Type of tissue that lines the interior and exterior body surfces
16. Organic molecules that the body needs in very small amounts
18. Contractions of smooth muscles that provide the force that moves food through the esophagus toward the stomach
19. Bile is stored in it
20. It connects the mouth to the stomach
23. Process by which enzymes break down food into small molecules that the body can use
27. Nutrients are absorbed throughout its walls
28. Group of organs that perform closely related functions
30. Enzyme that breaks down proteins into smaller polypeptide fragments
31. Found in saliva, it breaks the chemical bonds in starches

1. Protein catalyst that speeds up the rate of specific biological reactions
2. Group of similar cells that perform a particular function
3. It provides support for the body and connects its parts
6. Physical breakdown of large pieces of food
7. Made up of fatty acids and glycerol
8. Fingerlike projection in the small intestine
9. Constant internalphysical and chemical conditions that organisms maintain
11. First step in digestion
12. Basic unit of all forms of life
14. Large muscular sac that continues the mechanical and chemical digestion of food
15. Type of tissue that transmit nerve impulses throughout the body
17. Type of nutrient that is major source of energy for the body
21. Group of tissues that work together to perform closely related functions
22. Fluis loaded with lipids and salts
24. Movements of the body are possible because o it
25. Compound with an amino group on one end and a carboxyl group on the other end
26. Converts food into small molecules
29. Inorganic nutrient the body needs