DON FAWCETT & T. POLLARD / SCIENCE PHOTO LIBRARY DON FAWCETT & T. POLLARD / SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph of mitochondria from a hampster's adrenal cortex. Mitochondria are the sites of cell respiration: the chemical process which uses molecular oxygen to oxidise sugars & fats in order to produce energy. The energy is stored as adenosine triphosphate (ATP) & is used by the cell to drive chemical reactions such as protein formation. Mitochondria are bound by a double membrane. The inner membrane is folded to produce ingrowths (seen here) called cristae, which are where the chemical reactions of respiration occur. Yellow tint. Fawcett, The Cell, 2nd edition, P.453 fig.242.
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