The smallest unit of organization is the ______________.

• cell

• tissue

• organ

• organ system

A __________ is the basic unit of structure and function in a living thing.

• cell

• tissue

• organ

• organ system

A ___________ is a group of similar cells that perform the same function.

• cell

• tissue

• organ

• organ system

An _________ is a structure that is composed of different kinds of tissue.

• cell

• tissue

• organ

• organ system

Each organ in your body is part of an _________________, which is a group of organs that work together to perform a major function.

• cell

• tissue

• organ

• organ system

______________ tissue directs and controls the process by carrying electrical messages back and forth between the brain and other parts of the body.

• muscle

• nervous

• connective

• epithelial

The surfaces of your body, inside and out, are covered by _______________ tissue.

• muscle

• nervous

• connective

• epithelial

_____________ tissue provides support for your body and connects all its parts.

• muscle

• nervous

• connective

• epithelial

__________ tissue can contract, or shorten.

• muscle

• nervous

• connective

• epithelial

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

• stress

• homeostasis

• body systems