How Cellular Respiration Works

A quick lesson on how your cells turn food into energy.

Current design scheme: Ocean

C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + ATP energy

Sugar plus oxygen produces carbon dioxide, water, and usable energy. This is how your cells make ATP, the molecule they use for power.

Stage 1: Glycolysis

One glucose molecule is split into two smaller molecules, producing a little bit of ATP.

Stage 2: Krebs Cycle

The smaller molecules are broken down further inside the mitochondria, releasing carbon dioxide.

Stage 3: Electron Transport Chain

This final stage produces the most ATP of all three stages, around 34 molecules per glucose.

Without oxygen, cells can only make a small amount of energy through a backup process called fermentation.

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