| Term | Definition |
| calorie | the amount of energy required to raise the temperature of one gram of water by one degree celsius |
| glycolysis | The first step in the break down of glucose |
| cellular respiration | the process that releases energy by breaking down glucose and other food molecules in the presence of oxygen |
| fermentation | the process that releases energy from food molecules by producing ATP in the absence of oxygen |
| anaerobic | any process that occurs in the absence of oxygen |
| aerobic | any process that requires oxygen to occur |
| Calorie | is equal to 1 kilocalorie |
| pyruvic acid | main compound created by glycolysis |
| NAD+ | accepts and carries high energy electrons to the electron transport chain |
| Krebs cycle | pyruvic acid is broken down into carbon dioxide in a series of chemical reactions |
| electron transport chain | Uses high energy electrons from the krebs cycle and glycolysis to convert ADP into ATP |