Some cells, such as human nerve and muscle cells, contain many more mitochondria than do other cells, such as skin cells. Why do some cells have more mitochondria than others?

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Cells with a high energy demand, such as nerve and muscle cells, contain more mitochondria because mitochondria are the powerhouses of the cell, generating most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy.

Some Cells, Such as Human Nerve and Muscle Cells, Contain