Aerobic respiration in humans uses oxygen and mitochondria, while anaerobic respiration in cytoplasm produces lactate and little ATP, supporting usable cellular work and measurable biological activity.
Coverage 2013–2024 · Updated 15 Jul 2026
Cell respiration is an enzyme-controlled system that transfers energy released from carbon compounds into ATP; glucose and fatty acids are major substrates, although other organic compounds can also be used.
| Feature in humans | Aerobic respiration | Anaerobic respiration |
|---|---|---|
| Oxygen | Required | Not required |
| Substrate | Glucose, fatty acids and other organics | Carbohydrate/glucose |
| Location | Glycolysis in cytoplasm; later stages in mitochondria | Cytoplasm only |
| ATP yield | High | Low: net 2 ATP per glucose |
| Waste products | Carbon dioxide and water | Lactate |
Word equations: glucose + oxygen → carbon dioxide + water; glucose → lactate. In both cases energy released is transferred to ATP, but mitochondrial aerobic stages produce far more.
Cell respiration is chemical energy transfer inside cells; gas exchange is movement of oxygen and carbon dioxide across a surface. Mitochondria are required for aerobic but not human anaerobic respiration.
This objective is assessed through structured response, commonly using State / Compare / Identify.
State / Compare / Identify / Distinguish / Outline / Explain / Suggest
Build the answer around this relationship: Aerobic respiration requires oxygen and uses mitochondria.
Representative question
Carbon dioxide is released during cell respiration. Explain anaerobic and aerobic respiration.
ATP is the immediate energy carrier; hydrolysis powers cell work and phosphorylation reloads ATP. Cell respiration transfers energy from carbon compounds into ATP in controlled steps. Aerobic respiration in humans uses oxygen and mitochondria for high ATP yield, while anaerobic respiration in cytoplasm produces lactate and low ATP. Rate evidence comes from oxygen uptake or carbon dioxide production per unit time. Examples include membrane pumps, macromolecule synthesis, and chromosome movement. Rate depends on metabolic demand, organism size, oxygen, substrate, temperature, and pH.
