| A | B |
|---|
| homeostasis | process by which the delicate balance between the activities occurring inside the body and those occurring outside the body is kept stable |
| cells | the building block of living things |
| tissue | a group of similar cells that perform the same function |
| organ | a group of different tissues that have a specific job |
| organ system | a group of different organs that work together to perform a specific job |
| muscle tissue | the only tissue in the body that can contract or move |
| nerve tissue | tissue that carries messages back and forth between the brain, spinal cord, and every part of the body |
| epithelial tissue | tissue that forms a protective surface (e.x. the skin) |
| connective tissue | tissue that provides support for the body and connects all of its parts |
| nucleus | controls the activities of a cell |
| vacuole | storage areas for food, water, and waste |
| cell membrane | outer border that controls the movement of substances that enter and leave the cell |
| cytoplasm | jelly like material that holds all cell parts in their places |
| mitochondria | powerhouse of the cell; releases energy needed to do cellular activities |
