In cardiac muscle, mitochondria are distributed uniformly in a near-continuous field of myofilaments, ensuring that ATP is readily available. This transverse section is of right ventricular papillary muscle of cat heart. Figure 259 from Chapter 7 (Mitochondria) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.
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