Which organelle is the site of cellular respiration in eukaryotic cells?

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Cellular respiration that fuels the cell is carried out mainly in mitochondria, the organelles specialized for energy production. In aerobic respiration, sugars are broken down to produce electrons that travel through the electron transport chain in the inner mitochondrial membrane, driving the synthesis of ATP through oxidative phosphorylation. The citric acid cycle also occurs inside these organelles, further feeding electrons into the chain. The result is most of the cell’s usable energy.

Other organelles have different roles: the nucleus stores genetic material and regulates activities, chloroplasts (in plants) perform photosynthesis to make sugars, and ribosomes synthesize proteins. Mitochondria are unique in their direct involvement in turning fuel into ATP, and they even contain their own DNA, underscoring their specialized energy-producing function.