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Mitochondrion structure

Mitochondria are rod-shaped cell organelles around $$5-10\mu \text{ m}$$ in length and $$0.5\mu \text{ m}$$ in diameter. A mitochondrion is enclosed by two highly specialised membranes.

The two membranes create two separate mitochondrial compartments: the inter membrane space, which lies between the inner and outer membrane, and the internal matrix in the centre.

The inner membrane has a bigger surface than the outer membrane and is folded many times. The spaces created by these folds are called cristae. More active cells have mitochondria with more cristae.

Oxidative phosphorylation (ATP production) occurs on the cristae.

The Krebs cycle (the series of reactions that generate energy) takes place in the matrix.