Across
- 3. A condition in which bones become weak and break easily.
- 7. The condition in which an organism's internal environment is kept stable in spite of changes in the outside environment.
- 9. The basic unit of structure and function in a living thing.
- 11. The bones in movable joints are held together by _, which are made of strong connective tissue.
- 14. Organs called _ release chemical signals directly into the bloodstream.
- 15. What your body does in reaction to a stimulus.
- 16. The framework of your body.
- 20. The muscles that are under your conscious control.
- 21. The chemical signals released by the endocrine system.
- 23. The outer layer of the skin.
- 25. Bone has two types of soft connective tissue called _.
- 26. The clear, jellylike substance that holds many of the structures in a cell.
- 27. A structure that is made up of different kinds of tissue.
- 29. A place in the body where two bones come together.
- 30. A place where two bones come together.
- 32. Nutrients move from the digestive system into the bloodstream through a process called _.
- 34. A strong connective tissue called a _ attaches the muscle to a bone.
- 35. Carries electrical messages back and forth between the brain and other parts of the body.
- 38. Provides support for your body and connects all its parts.
- 39. Muscles that provide the force that moves your bones.
- 40. Directs the cell's activities and holds information that controls a cell's function.
- 41. Strands of hair grow within the dermis in _.
- 42. The stomach and blood vessels contain _ tissue.
- 43. Covers the surface of your body, inside and out.
Down
- 1. Attached to the bones of your skeleton and provide the force that moves your bones.
- 2. The tissue called _ is found only in your heart.
- 4. The gener
- 5. A strong connective tissue that is more flexible than bone.
- 6. A total of 26 small bones that make up your backbone.
- 8. Can contract or shorten to make your body parts move.
- 10. A group of organs that work together, carrying out major functions.
- 12. A pigment that colors skin.
- 13. Forms the outside border of a cell.
- 17. A group of similar cells that perform the same function.
- 18. The inner layer of the skin.
- 19. A hard and dense bone that isn't completely solid.
- 22. The small spaces within _ make it lightweight bit still strong.
- 24. Openings that allow sweat to reach the surface.
- 28. A substance that you get from food and that your body needs to carry out processes, such as contracting muscles.
- 31. Includes all the bones in your body.
- 33. Muscles that aren't under your conscious control.
- 36. A signal in the environment that makes you react.
- 37. Skeletal muscles are sometimes called _.