| A | B |
|---|
| muscle tissue | contracts or shortens, making body parts move |
| nervous tissue | carries electrical messages back and forth between the brain and every other part of the body |
| connective tissue | provides support for the body and connects all of its parts |
| epithelial tissue | covers the surfaces of the body, inside and out |
| organ | structure composed of different kinds of tissue |
| organ system | work together to form a major function of the body |
| homeostasis | the process by which an organism's internal environment is kept stable |
| stress | reaction of a person's body to threatening, challenging or disturbing events |
