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Difference Between Aerobic Respiration and Anaerobic Respiration

Cells release energy from glucose either with oxygen (aerobic) or without it (anaerobic).

In short

Aerobic respiration uses oxygen to completely break down glucose into CO₂ and water, releasing a large amount of energy (~38 ATP); anaerobic respiration occurs without oxygen, gives incomplete breakdown and releases far less energy (~2 ATP).

Aerobic Respiration vs Anaerobic Respiration - Comparison Table

BasisAerobic RespirationAnaerobic Respiration
OxygenRequiredNot required
End productsCO₂ + waterEthanol/lactic acid + CO₂
Energy (ATP)High (~38 ATP)Low (~2 ATP)
Breakdown of glucoseCompleteIncomplete
SiteCytoplasm + mitochondriaCytoplasm only
Occurs inMost plants and animalsYeast, some bacteria, muscle (temporarily)

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Frequently Asked Questions - Aerobic Respiration vs Anaerobic Respiration

Why does aerobic respiration release more energy?
Aerobic respiration completely oxidises glucose to CO₂ and water using oxygen, extracting almost all its chemical energy (~38 ATP). Anaerobic respiration only partly breaks glucose down, so it releases much less.
What is anaerobic respiration in muscles?
During heavy exercise when oxygen is scarce, muscle cells respire anaerobically, converting glucose to lactic acid. The build-up of lactic acid causes muscle fatigue and cramps.

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