| Term | Definition |
| slow twitch | for sustained contractions, endurance, aerobic |
| fast twitch | for quick contractions, power, anaerobic |
| breathing | exchange of gases |
| respiration | production of energy from food molecules |
| ATP | adenosine triphosphate |
| aerobic | with oxygen, takes place in mitochondria, produces 36-38 ATP |
| anaerobic | without oxygen, takes place in cytoplasm, produces 2 ATP |
| glycolysis | break down of sugar, produces 2 ATP |
| Kreb Cycle | produces 2 ATP per glucose molecule, NADH, and FADH2 |
| electron transport chain | as electrons pass through a series of proteins, energy is released, produces 32-34 ATP |
| lactic acid fermentation | anaerobic respiration, makes lactic acid |
| ethyl alcohol fermentation | anaerobic respiration, makes alcohol |
| photosynthesis | food molecules and oxygen made by light |
| glucose | C6H12O2 + 6O2 |
| fermentation | when muscle cells can't get the oxygen they need to produce ATP by respiration |
| heat | extra energy that is not stored is released as this |
| chlorophyll | gives plants their green color |