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Minerals INORGANIC SUBSTANCES that are involved in many of the body's chemical reactions Organic Compounds COMPOUNDS containing CARBON with few exceptions Cell The SMALLEST FUNCTIONAL UNIT in an organism Tissue GROUPS OF SIMILAR CELLS that do the same sort of work Organ A STRUCTURE MADE UP OF DIFFERENT TYPES OF TISSUES that work together Organ System A GROUP OF ORGANS that work together to do a certain job Digestion The BREAKDOWN OF FOODS you eat into smaller and simpler molecules that can be used by the cells in your body Enzyme A PROTEIN that helps the body carr out CHEMICAL REACTIONS Villi TINY FINGERLIKE projections Absorption PROCESS in which FOOD MOLECULES PASS through the walls of the Villi and into the BLOODSTREAM Cellular Respiration A SERIES of CHEMICAL PROCESSES in which OXYGEN COMBINES WITH FOOD MOLECULES and ENERGY IS RELEASED Alveoli In the LUNGS, the TINY, THIN-WALLED sacs surrounded by capillaries where EXCHANGE OF OXYGEN & CARBON DIOXIDE takes place Excretion The REMOVAL of WASTE PRODUCTS Homeostasis PROCESS when a body MAINTAINS STABLE INTERNAL ENVIRONMENT Negative Feedback Mechanism that helps the body CHANGE INTERNAL CONDITION and RETURN TO NORMAL STATE