Mitochondrion. Coloured high resolution scanning electron micrograph (SEM) of a single mitochondrion in a pancreatic acinar cell. The cylindrical mitochondrion (green, centre) has two membranes: an outer surrounding membrane; an inner membrane which forms folds called cristae. It is on the cristae that chemical reactions occur. Mitochondria are sites of cell respiration: sugars and fats are oxidised to produce energy which is then stored. They are thus called 'powerhouses' of the cell. Magnification unknown.

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