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basic unit of structure and function in living things

cell membrane

the outside boundary of a cell


the control center of a cell that directs the cell's activities and contains the information that determines the cell's form and function


the material within a cell apart from the nucleus


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


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


The process by which an organism's internal environment is kept stable in spite of changes in the external environment.


the reaction of a person's body to potentially threatening, challenging, or disturbing events

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