Chapter One Vocabulary

2. Releases chemical signals directly into the bloodstream, part of the endocrine system.
9. A structure that is made up of different kinds of tissue and performs a specific job.
11. Forms the outside border of the cell.
12. A signal in the environment that makes you react.
14. A clear jellylike substance that contains many cell structures.
15. A group of similar cells that perform the same function.
16. Chemical signals released by the endocrine system.
17. Attached to the bones of your skeleton and provide the force that moves your bones.
18. What the body does in reaction to a stimulus.

1. A group of organs that work together, carrying out major functions.
3. Directs the cell's activities and holds information that controls a cell's function.
4. Nutrients move from the digestive into the bloodstream.
5. The condition which an organism's internal environment is kept stable in spite of changes in the outside environment.
6. The basic unit of structure and function in a living thing.
7. Includes all the bones in your body.
8. A place where two bones come together.
10. A substance that you get from food and that your body needs to carry out processes.
13. The reaction of your body to possibly threatening, challenging or uncomfortable events.