B) The membranes and compartments of mitochondria.

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b) The membranes and compartments of mitochondria.

Fig.7-2A gallery of mitochondrial types,

(a) A large, spherical mitochondrion from the adrenal cortex of the rat, with cristae in the form of tubes or vesicles. The matrix is conspicuously granular, x 35,000. Courtesy of D. S. Friend,

(b) An isolated, partially spread mitochondrion from the protistan Euplotes. This mitochondrion, which was released from a cell disrupted on a water-air interface, contains tubular cristae typical of many ciliate protists. The outer membrane (arrows) has been lost except at a few locations, x 29,000. Photograph by the author,

(c) Mitochondrion from the sphincter muscle of the crayfish vas deferens. The cristae in this mitochondrial type take on a triangular profile, x 91,000. Courtesy of M. A. Cahill, from J. Cell Biol. 74 : 326 (1977), by copyright permission of the Rockefeller University Press,