Body Systems Part 1

3. This links together your arteries and veins.
6. This organ pumps blood and substances around the body in tubes called blood vessels.
9. This blood vessel carries blood away from the heart with oxygen.
10. Muscles that you can't move consciously, they just keep working.
15. Refers to a living thing that has an organized structure, such as animals, plants, fungi.
16. A collection of tissues that carries out a function or set of related ones.
17. This organ is where the exchange of gases takes place.

1. The smallest unit that can live on its own and that makes up all living organisms.
2. This body system carries blood and dissolved substances to and from different places in the body.
4. The main job of this body system is to move fresh air into your body while removing waste gases.
5. This gas is what you take in when you inhale, it attaches to the red blood cells.
7. Muscles that you are able to control.
8. This body system makes up the foundation of our bodies and protects our internal organs.
11. An organ that contracts and gets shorter – this provides the force to move your body parts.
12. This makes up the framework of the skeletal system.
13. A group of cells that have similar structure and that function together as a unit.
14. This blood vessel carries blood back to the heart and lungs.