Cells and Body Systems

3. the part of a cell that directs all cellular activity
7. the upper area of the heart that receive blood from the body and lungs
9. hold the three lenses that have different magnification
12. an optical device that is used for viewing very small objects
15. made of only a singular cell
16. tiny blood vessels that connect arteries to veins made of one thick layer of cells
17. contains a lens that is used to magnify
18. the movement of particles from an area of high concentration to a lower concentrated area
22. used to bring the object used in a microscope into a sharper focus
23. a group of organs that come together to perform a certain task, like breathing or digesting foods
24. parts of an organism that perform specific tasks
25. a group of tissues that come together to perform a certain function

1. the purpose or task
2. the part where nutrients, water, or other substances are held in a cell
4. a group of similar cells that all come together to perform a certain function
5. an organism's reaction to a stimulus
6. a system that is used to remove different forms of waste from the inside to the exterior of the body
8. selects what can and can’t pass through. Ex. this is what a Cell Membrane is
10. Basic unit of life
11. the lower part of the heart that pump blood into the body
13. a gateway used to bring needed materials in and waste materials out
14. the part of a microscope that supplies the light
19. Substances what have energy and materials that organisms need in order to grow
20. Living things that have six specific Characteristics
21. a large muscle used to help get air in and out of the lungs