Body Systems

2. Outer covering of a cell that provides strength and support; found only in plant cells.
3. Organelle that stores water and other substances required by the cell.
7. Tiny blood vessel that connects arteries to veins
9. Wave-like muscle contractions along the digestive system.
11. The basic unit of life.
12. The movement of particles from an area of higher concentration to an area of lower concentration.
13. _____digestion is the physical breakdown of food into small particles.
15. Blood vessels that carry blood from the body back to the heart.
19. Organelle that converts sunlight into food
22. ______system provides a mobile support frame for the body; protects soft tissue organs.
23. ______system removes chemicals and gaseous wastes from the body.
24. A layer of material that serves as a barrier to certain particles.
25. Diffusion of water through a selectively permeable membrane.
26. A structure or behaviour that increases the organisms chance of survival or reproduction.
27. An abnormal condition affecting the body of an organism.

1. ______ system coordinates and controls all organs and organ systems; detects, processes, and responds to stimulii.
4. Organelles that convert energy the cell receives into a form that it can use.
5. Tiny air-filled sacs at the end of the bronchial tubes in your lungs, where gas exchange takes place (oxygen is absorbed and carbon dioxide is excreted).
6. Group of tissues that work together to perform a specific function.
8. ______ system supplies blood with oxygen from the outside air and removes carbon dioxide from you blood.
10. ______ system transports blood reaching every cell in the body
14. Thin structure that encloses all the contents of plant and animal cells
16. Blood vessel that carries blood from the heart to the rest of the body.
17. Group of similar cells working together to perform a specific function.
18. Organelle that directs all the activities in a cell. Contains all of the cell's DNA.
19. ______ digestion is the breakdown of large food particles to smaller food particles by enzymes and chemical processes.
20. Contents of the cell inside the cell membrane excluding the nucleus
21. _____ system breaks down food into smaller parts for absorption into the body.