Human Body Systems

4. The maintenance of a constant internal state in a changing environment
6. Type of involuntary muscle found in the heart
8. The system that breaks down food so that it can be used by the body
10. A blood vessel that carries blood away from the heart to the body's organs
12. The system that supports the body and provides protection
13. A collection of tissues that carry out a specialized function of the body
14. The system that allows movement of body parts
15. The system that protects the body against infection
18. The system that rids the body of waste and excess water
20. The fluid that carries gases, nutrients, and waste throughout the body
22. Type of involuntary muscle found in internal organs such as the intestines

1. The system that takes in oxygen and expels carbon dioxide
2. The system that moves blood through the body
3. The primary organ of the cardiovascular system
5. A tiny blood vessel that allows an exchange between blood and cells in tissue
7. Connects muscle to bone
9. Holds together the bones in a joint
11. A group of similar cells that perform a common function
12. A group of organs that interact in the body
16. A blood vessel that carries blood to the heart
17. The system that controls the actions and reactions of the body
19. The smallest unit that can perform life processes
21. A place where two or more bones meet