Here's why:
* Mitochondria are the powerhouses of the cell: They are responsible for cellular respiration, the process of converting glucose into ATP (adenosine triphosphate), the primary energy currency of cells.
* Energy-demanding cells need more ATP: Cells that perform active processes like muscle contraction, nerve impulse transmission, or protein synthesis require a constant supply of energy.
* More mitochondria = more ATP production: Cells with a high energy demand have a higher number of mitochondria to increase their ATP production capacity.
Examples of cells with high numbers of mitochondria:
* Muscle cells: Muscle contraction requires a lot of energy.
* Nerve cells: Nerve impulse transmission is an energy-intensive process.
* Liver cells: The liver performs many metabolic functions that require energy.
Therefore, the presence of a high number of mitochondria is a key characteristic of body cells that require large amounts of energy.
