PROFESSORS P. MOTTA & T. NAGURO / SCIENCE PHOTO LIBRARY PROFESSORS P. MOTTA & T. NAGURO / SCIENCE PHOTO LIBRARY
Mitochondrion. Coloured high resolution scanning electron micrograph (SEM) of a single mitochondrion in the cytoplasm of an intestinal epithelial cell. The cylindrical mitochondrion (blue, 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: x19,250 when printed 10 centimetres wide.
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