* Muscle cells: These cells require a constant supply of ATP (energy) for contraction and movement.
* Nerve cells: Nerve cells transmit electrical impulses, which requires a significant amount of energy.
* Sperm cells: Sperm cells need energy to swim towards the egg.
* Liver cells: Liver cells perform many metabolic functions, which require energy.
* Kidney cells: Kidney cells filter waste products from the blood, a process that requires energy.
* Heart muscle cells: These cells work tirelessly to pump blood, requiring a constant energy supply.
Why Mitochondria?
Mitochondria are often called the "powerhouses" of the cell because they are responsible for producing ATP through cellular respiration. The more mitochondria a cell has, the more ATP it can produce, and the more energy it has available.
