Unit B: Cells and Systems

5. A series if tube like passages into the lungs
6. Optical device used for viewing a very small object
7. a membranous sac in humans and other animals, in which urine is collected for excretion
9. Made up of more than one cell
10. A group of organs that work together to perform a certain task
11. Anything that causes a response in organism
12. Protects the plant
14. Transports water
16. This system breaks down the food
17. A group of tissues that work together to perform a specific function
19. It transports food and water to different parts of the plant
23. Structure in cells that perform a certain function
24. Common unicellular organisms that live in water
25. a band or bundle of fibrous tissue in a human or animal body that has the ability to contract, producing movement in or maintaining the position of parts of the body
26. The diffusion of water through a selectively permeable membrane

1. any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart
2. Purpose or task
3. Produces food for plants (Only found in leaves)
4. Substances that provide energy and materials to organisms
8. This system removes waste from the body
13. The ability to make things move or change
15. All the life process that takes place in the cell ; includes energy
18. A chemical waste that the body produces when cells break down protein
20. The process which moves air in and out of the lungs
21. Basic unit of life
22. Transports food