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SCience
| Term | Definition |
|---|---|
| tissue | a group of similar cells that perform a specific function |
| organ | a body structure that is composed of different kinds of tissues that work together |
| organ system | a group of organs that work together to perform a major function |
| stimulus | any change of 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 |
| gland | an organ that produces and releases chemicals either through ducts or into the bloodstream |
| hormone | the chemical produced by an endocrine gland that affects growth and develop- ment |
| stress | the reaction of a person's body to potentially threatening, challenging or disturb- ing events |
| digestion | the process that breaks complex molecules of food into smaller nutrient molecules |
| nutrients | substances in food that provide the raw materials and energy needed for an organisms to carry out its essential processes |
| carbohydrates | an energy-rich organic compound, such as sugar or a starch, that is made of the elements of carbon, hydrogen, and oxygen |
| peristalsis | waves of smooth muscle contractions that move food through the esophagus toward the stomach |
| saliva | a fluid produced in the mouth that aids in mechanical and chemical digestion |
| enzyme | a type of protein that speeds up chemical reactions in the body |
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