| A | B |
|---|
| homeostasis | balance between activities in and outside of body |
| energy | this is required for life activities |
| cells | what human body is made of |
| unicellular | made of one cell |
| multicellular | made of many cells |
| levels of organization in multicellular organisms | cells, tissues, organs, organ systems |
| tissue | group of similar cells that perform same job |
| muscle tissue | only body tissue that contracts (shortens/moves) |
| connective tissue | tissue that provides support for body; connects all body parts |
| nerve tissue | carries messages back & forth between brain, spinal cord, & body |
| epithelial tissue | forms protective surface on outside of body (skin, inside mouth, etc) |
| organ | different tissues with a specific job (heart, stomach, etc) |
| organ system | group of organs working together to do a specific job (digestion, etc) |
| number of organ systems in body | Eleven |
