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Human Body Systems/1
Lesson 1 - 3
| Term | Definition |
|---|---|
| Cell | The basic unit of structure and function in living things. |
| Cell membrane | A thin, flexible barrier that surrounds a cell and controls which substances pass into and out of a cell. |
| Nucleus | In cells, a large oval organelle that contains the cell's genetic material in the form of DNA and controls many of the cell's activities. |
| Cytoplasm | The thick fluid region of a cell located inside the cell membrane (in prokaryotes) or between the cell membrane and nucleus (in eukaryotes). |
| 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 other parts of the body. |
| Connective tissue | A body tissue that provides support for the body and connects all its parts. |
| Epithelial tissue | A body tissue that covers the interior and exterior surfaces of the body. |
| Organ | A body structure that is composed of different kinds of tissues that work together. |
| Organ system | A group of organs that work together, performing major functions. |
| Skeleton | The inner framework made up of all the bones of the body. |
| Skeletal muscle | A muscle that is attached to the bones of the skeleton and provides the force that moves the bones. |
| Joint | A place in the body where two bones come together. |
| Nutrient | A substance such as nitrogen or phosphorus that enables plants and algae to grow. |
| Absorption | The process by which nutrient molecules pass through the wall of the digestive system into the blood. |
| Gland | An organ that produces and releases chemicals either through ducts or into the bloodstream. |
| Stimulus | Any change or signal in the environment that can make an organism react in some way. |
| Response | An action or change in behavior that occurs as a result of a stimulus. |
| Hormone | A chemical that affects growth and development and the chemical produced by an endocrine gland. |
| Homeostasis | The condition in which an organism's internal environment is kept stable in spit of changes in the external environment. |
| Stress | A force that acts on rock to change its shape and volume and the reaction of a person's body to potentially threatening, challenging, or disturbing events. |
Created by:
ggarcia489
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