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Chapter 1

Across
The process by which nutrient molecules pass through the wall of the digestive system into blood.
A thin, flexible barrier that surrounds a cell and controls which substances pass into and out of the cell.
The thick fluid region of a cell located inside the cell membrane or between the cell membrane and nucleus.
A body tissue that provides support for the body and connects all of its parts.
A place in the body where two bones come together.
A body structure that is composed of different kinds of tissues that work together.
A muscle that is attached to the bones of the skeleton and provides the force that moves the bones; also called striated muscles.
Any change or signal in the environment that can make an organism react in some way.
A chemical that affects growth and development; a chemical produced by an endocrine gland.
The condition in 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.
Substances in food that provide the raw materials and energy needed for an organism to carry out its essential processes.
Down
A group of similar cells that perform the same function.
An organ that produces and releases chemicals either through ducts or into the bloodstream
A group of organs that work together, performing major functions.
A body tissue that contracts, or shortens, making body parts move.
A large oval organelle that contains the cells genetic material in the form of DNA and control's many of the cell's activities.
A body tissue that carries electrical messages back and forth between the brain and other parts of the body.
A body tissue that covers the exterior and interior surfaces of the body.
The inner framework made up of all of the bones of the body.
The basic unit of structure and function in living things.
An action or change in behavior that occurs as a result of a stimulus.