Cells with high energy demands are expected to have more mitochondria. This is because mitochondria are the powerhouses of the cell, responsible for producing ATP (adenosine triphosphate), the primary energy currency of the cell. Here are some examples of cells with high energy demands and therefore more mitochondria:

* Muscle cells: Muscle cells require a lot of energy for contraction and movement.

* Nerve cells: Nerve cells need energy to transmit nerve impulses.

* Liver cells: Liver cells perform many metabolic functions, including detoxification and energy storage, requiring significant energy.

* Sperm cells: Sperm cells require a lot of energy to propel themselves towards the egg.

* Heart cells: Heart cells continuously pump blood, requiring a constant energy supply.

* Kidney cells: Kidney cells filter waste products and regulate electrolytes, demanding considerable energy.

Other factors that can influence the number of mitochondria in a cell include:

* Cell type: Different cell types have different energy requirements.

* Cell activity: Cells with high levels of activity, such as those involved in growth or repair, will have more mitochondria.

* Age: As cells age, the number of mitochondria may decrease.

* Environmental factors: Factors like oxygen levels and nutrient availability can influence mitochondrial density.

It's important to remember that while some cells are known to have more mitochondria than others, the actual number can vary depending on individual circumstances.