Which of these body cells has the greatest number of mitochondria?
A) Tibia bone cells
B) Breast tissue
C) Cardiac muscle
D) Subcutaneous skin
C
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Mitochondria are very abundant in cells that consume energy. The cardiac muscle cells, which must work continually to keep the heart contracting, contain a great number of mitochondria. Milk-producing cells in breast tissue, which are normally dormant, contain very few. Cells of bone and of subcutaneous tissue do not consume a great deal of energy; therefore, they have smaller numbers of mitochondria than cardiac muscle.
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