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Info Processing
Grade 7 Test Review
Term | Definition |
---|---|
Unicellular | organism composed of a single cell |
Multicellular | organism composed of more than one cell |
Cell | the smallest unit that can perform life functions |
Cell Differentiation | the process of cells becoming more specialized |
Cell theory | 1. all organisms are composed of one or more cells 2. a cell is the basic unit of structure and organization in organisms 3. all cells come from pre-existing cells |
Nucleus | Directs all cell activities and contains DNA |
Chloroplasts | Green organelle that contains chlorophyll and is where food is made |
Mitochondria | Where energy is stored until it is released. Mitochondria releases energy by breaking down food, carbon dioxide, and water. |
Cell membrane | A protective layer around all cells |
Cell wall | Tough, rigid outer covering that protects the cell and gives it shape |
Cell Organization | Cell-> Tissue-> Organs-> Organ System |
Homeostasis | A state of balance among all the systems needed for the body to survive and function correctly. |
Osmosis | diffusion of water |
Diffusion | movement of particles from areas of high concentration to areas of low concentration |
Stimulus | anything that causes some change in an organism |
Response | reaction to stimulus |
Sensory receptor | specialized cells that detect changes in the environment |
Motor neuron | cells in the brain and spinal cord that allow us to move, speak, swallow and breathe |