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Cells & Organization

Levels of organization terms and definitions

Cell The basic unit of structure and function in living things
Structure An organism’s body plan, or the way its parts are arranged
Function The job or process that an organism’s structure carries out
Nucleus The control center of the cell that directs the cells’ activities and determines the cell’s characteristics
Tissue A group of similar cells that perform a specific function in an organism
Organ A structure in the body that is composed of different kinds of tissue
Organ system A group of organs that work together to perform a major function in the body
Homeostasis The process by which an organism’s internal environment is kept stable in spite of changes in the external environment
Stimulus A change in an organism’s surroundings that causes the organism to react
Response An action or change in behavior that occurs as the result of a stimulus
Stress The reaction of a person's body and mind to threatening, challenging, or disturbing events
4 Levels of Organization in the body Cell, Tissue, Organ, Organ System
Created by: bmercer