Hand Copy and Return to Mrs. Woods
Body Organization and Homeostasis
 The levels of organization in the human body consist of cells, tissues,
organs and organ systems
I. Cells
- cells carry on the processes that keep organisms alive
II. Tissues
 tissue- a group of similar cells that perform the same function
 The body has four types of tissues:
1. muscle tissue – can contract or shorten, making the
body move
2. nervous tissue – carries electrical messages to and from
the brain from and to other parts of the body – directs
`and controls movement
3. connective tissue – provides support for your body and
connects all of its parts
- EX: Bone & Fat
4. epithelial tissue – lines the surfaces of the body, inside
and out
- EX: Skin protects against disease and moisture
loss
- EX: The lining of your digestive system absorbs
the nutrients from food
III. Organs and Organ Systems
* organ – a structure that is composed of different kinds of tissues that
has a specific and complex job
* organ system – a group of organs that work together to perform a
major function
* There are eleven organ systems in the human body:
IV. Homeostasis
* homeostasis is the process by which an organism’s internal
environment is kept stable in spite of changes in the external
environment