| A | B |
| Calorie | The amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius |
| Glycolysis | A pathway that releases only a small amount of energy. |
| Cellular Respiration | The process that releases energy by breaking down glucose and other food molecules in the presence of oxygen. |
| NAD+ | An electron carrier that accepts a pair of high energy electrons. |
| Fermentation | A process that releases energy from food molecules by producing ATP in the absence of oxygen. |
| Anaerobic | A process that does not require oxygen. |
| Aerobic | A process that requires oxygen. |
| Krebs cycle | The second stage of cellular respiration in which pyruvic acid is broken down into carbon dioxide in a series of energy extracting reactions. |
| Electron Transport Chain | Uses high energy electrons from the Krebs cycle to convert ADP into ATP. |