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Grade 7 Test Review

TermDefinition
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
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