Cell and Body Systems

5. An organism made up of just one cell
8. The movement of particles of a substance from an area of higher concentration to an area of lower concentration
9. Purpose or task
11. Made of more than one cell
12. Describes a membrane with very small openings that allow particles of some substance but not others to pass through
14. Hair like extensions that protrude from the surface of some unicellular organisms and from some cells in multicellular organisms
15. cells that have specific structures that help them to perform particular functions
18. The basic unit of life.
20. Reaction to stimulus
22. Organelles that convert energy the cell receives into a form it can use
23. Transport system reaching every cell in body.
24. Group of tissues that work together to perform a specific function
25. Foot like projections on an amoeba

1. Small, pliable cells that have no nucleus and are specialized for carrying oxygen to all the cells of the body
2. Any change in an organism's environment
3. Disease in which mucus builds up in the bronchi and causes them to become narrower
4. Tiny blood vessels that connect arteries to veins
6. Group of cells that work together to perform a specific function
7. Allows movement
10. The physical breakdown of food into smaller particles.
13. Waste removal
16. Type of microscopic organism
17. Coordinates and controls all organs
19. Structures in cells that perform a certain function
21. The ability to make things move and change