← Human Body Systems Test Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All Enzyme A protein that is capable of speeding up a chemical reaction. http://farm1.staticflickr.com/168/431507324_90215df80a.jpg Tissue A group of similar cells that work together to carry out a specific function. The function of muscle tissue, for example, is to contract. http://farm1.staticflickr.com/34/275483146_6716ab9d85.jpg Body System A group of organs that work together to perform a specific function. For example, the organs of the digestive system process food and prepare it for delivery to the body's cells. http://farm3.staticflickr.com/2585/3974874908_c33c3f542a.jpg Organ A group of different tissues that work together to perform a specific function. Examples include the heart, liver, and brain. http://farm3.staticflickr.com/2475/4015700885_7d65f01143.jpg Peristalsis Regular muscular contractions that move food through the digestive tract. Diffusion The process by which molecules move from places where they are more concentrated to places where they are less concentrated. A form of passive transport. http://farm3.staticflickr.com/2797/4394776418_39eee3cf8a.jpg Chemical Digestion the digestion process in which enzymes are used to break foods into their smaller chemical buiding blocks Mechanical Digestion Part of digestion that uses movement and muscles to break down food Heartburn Occurs when stomach acids backup into the esophagus causing painful discomfort in the chest Liver large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity Gall Bladder organ that stores bile. Pancreas the organ that lies behind the stomach and that makes digestive enzymes and hormones that regulates sugar levels. Appendix a vestigial process that extends from the lower end of the cecum and that resembles a small pouch Small Intestine organ that completes the chemical digestion of food and absorbs the nutrients. Large Intestine the last section of the digestive system, where water is absorbed from food and the remaining material is eliminated from the body Active Transport transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient. Passive Transport the movement of substances across a cell membrane without the use of energy by the cell Bile a digestive juice secreted by the liver and stored in the gallbladder.