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Discussion

A tissue with a high energy demand, such as cardiac muscle, is characteristically rich in

  • A.smooth endoplasmic reticulum membrane networks
  • B.peroxisomes and their catalase and oxidases
  • C.mitochondria with densely packed cristae
  • D.lysosomes packed with their digestive enzymes

Answer: C

Both the number of mitochondria and the folding within each rise with demand, since ATP output depends on inner membrane area. Muscle that works continuously shows this most clearly of all. Cardiac muscle never rests, so its demand is continuous rather than episodic.

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