| Aerobic Respiration |
Most efficient form of respiration. |
Requires Oxygen |
Carbon dioxide and water |
Human cells, most organisms |
| Anaerobic Respiration |
Occurs in the absence or limited supply of oxygen. |
No Oxygen Required |
Various end products depending on the pathway (e.g., lactic acid or ethanol) |
Yeast, bacteria, muscle cells |
| Lactic Acid Fermentation |
Anaerobic process producing lactic acid. |
No Oxygen Required |
Lactic acid |
Muscle cells during intense exercise, some bacteria |
| Alcoholic Fermentation |
Anaerobic process producing ethanol and CO2. |
No Oxygen Required |
Ethanol and carbon dioxide |
Yeast (used in brewing and baking), some bacteria |
| Krebs Cycle (Citric Acid Cycle) |
Part of aerobic respiration. |
Requires Oxygen |
Carbon dioxide, ATP, NADH, FADH2 |
Mitochondria of eukaryotic cells |
