Cells and Body Systems

2. group of tissues that work together to preform a a specific function
4. group of similar cells working together to preform a specific function
6. made of just one cell
8. band of muscle in the eye that controls the size of the pupil
9. opening of the eye that lets in lights
14. transport system reaching every cell in the body
15. thick walled blood vessels that take blood way from the heart to the rest of the body
17. blood vessels that return blood from the body to the heart; have values
18. breaks down the food you eat into parts small enough to be absorbed and transported through out the body
19. small, pliable cells that have no nucleus and are specialized for carrying oxygen to all the cells of the body
21. provides a mobile support frame for the body; protects soft-tissue organs
22. liquid in stomach made of mucus, hydrochloric acid, enzymes and water; chemically digests food
23. lens or sets of lenses in a microscope or telescope

1. an organ of soft nervous tissue contained in the skull
3. system coordinates and controls all organs and organ systems
5. basic unit of life
7. supplies blood with oxygen from the outside air and removes carbon dioxide
8. protects body's internal environment from the external environment
10. blood cells specialized to fight infection
11. covers the surface of the body and internal organs
12. group of organs that work together to preform a certain task, such as digestion or breathing
13. moves bones, moves organs that contains muscle tissue
16. removes chemical and gaseous wastes from the body
20. substance created by the body to carry out chemical digestion