Body Organization and Homeostasis

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cell
basic unit of structure and function in living things
cell membrane
the outside boundary of a cell
nucleus
the control center of a cell that directs the cell's activities and contains the information that determines the cell's form and function
cytoplasm
the material within a cell apart from the nucleus
tissue
a group of similar cells that perform the same function
muscle tissue
a body tissue that contracts or shortens, making body parts move
nervous tissue
A body tissue that carries electrical messages back and forth between the brain and every other part of the body.
connective tissue
a body tissue that provides support for the body and connects all of its parts
epithelial tissue
a body tissue that covers the surfaces of the body, inside and out
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.
stress
the reaction of a person's body to potentially threatening, challenging, or disturbing events