| A | B |
|---|
| cells | microscopic parts of organisms that look like tiny boxes |
| theory | a group of ideas that tries to explain something |
| nucleus | the part of a cell that controls the cell's life functions |
| cytoplasm | the material inside a cell and outside of the nucleus |
| cell membrane | the thin outer skin of a cell |
| vacuole | a storage space in a cell |
| protoplasm | the living material in a cell |
| chloroplast | the part of a plant cell that contains colorophyll |
| cellulose | a hard, nonliving material that forms the cell wall of a plant cell |
| chlorophyll | a greem material found in choloroplasts |
| impulse | the message carried by a nerve cell |
| red blood cell | a blood cell that carries oxygen |
| white blood cell | a blood cell that helps to destroy germs |
| platelet | a blood cell that helps blood to clot |
| tissue | a group of cells that look alike and work together to do the same job |
| epithelial tissue | tissue that covers the body and many of its parts |
| plasma | a yellow liquid that is the liquid part of the blood |
| neuron | nerve cell |
| organ | a group of tissues that work together to do a special job |
| organ system | a group of organs that work together |
| digestive system | an organ system made up of organs that digest food |
| scalpel | a sharp tool used for cutting through tissue |
| probe | a tool used for searching and for moving organs |
