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Across 3. the most important nutrient 6. System that works with brain, spinal cord, nerves. 8. System that works with hypothalamus, pituitary, thyroid, parathyroids, adrenals, pancreas, ovaries, testes. 11. inorganic nutrients that the body needs, usually in small amounts. 16. as food passes through the digestive system, it is broken down in two ways. 17. the amount of heat needed to raise the temperature. 18. describes the relatively constant internal physical and chemical conditions that organisms maintain despite changes in internal and external environments. 20. organic molecules that the body needs in very small amounts. 22. System that works with skeletal muscle, smooth muscle, cardiac muscle. 24. one of few nonplant foods that is a rich source of carbohydrates. 25. movements of the body are possible because...tissue. 28. the tissue that lines the interiro and the exterior body surfaces. 30. contain simple sugars and fiber 31. nerve impulses are transmitted throughout the body. 32. System that works with skin, hair, nails, sweat and oil glands. 34. large muscular sac that continues the chemical and mechanical digestion of food. 35. a major source of energy for the body. 36. System that works with skin, lungs, liver, kidneys, ureters, urinary bladder, urethra. 37. process in which a stimulus produces a response that opposes the original stimulus. 38. a group of cells that perform a single function. 39. a group of organs that perform closely related functions.

Down 1. the basic unit of structure and function in living things. 2. a group of different tissues that work together to perform a single function. 4. a type of tissue that provides support for the body and connects its parts. 5. breaks proteins into smaller polypeptide fragments. 7. System that works with nose, pharynx, larynx, trachea, bronchi, bronchioles, lungs 9. System that works with mouth, pharynx esophagus, stomach, smal and large intestines, rectum. 10. System that works with white blood cells, thymus, spleen, lymph nodes, lymph vessels. 12. the process of putting food into your mouth 13. form the throat, the bolus passes thorugh a tube 14. System that works with bones, cartilage, ligaments, tendons 15. System that works with testes, epididymis, vas deferens, urethra, and penis. 19. the duodenum is the first part of the.... 21. System that works with heart, blood vessels, blood. 23. help the body absorb fat-soluble vitamins and are part of cell membranes, nerve cells, and certain hormones. 26. the reason is that contractions of smooth muscles 27. The levels of organization in the body include cells, tissues, organs, and... 29. saliva contains an enzyme called... 33. supply raw materials for growth and repair of structures such as skin and muscle.