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Mitochondria are unusual organelles. They act as the power plants of the cell, are surrounded by two membranes, and have their own genome. They also divide independently of the cell in which they reside, meaning mitochondrial replication is not coupled to cell division.
Mitochondria supply the cell with ATP (Adenosine Triphosphate), which is the energy the cell needs. A heart cell is a type of muscle cell which needs plenty of energy to con â¦ tract and keep functioning. This is why a heart cell needs more mitochondria than other cells-because they need more energy.