Suggest an example of human cells that also have a large number of mitochondria

Muscle cells, particularly cardiac muscle cells (cardiomyocytes) and skeletal muscle cells, are excellent examples of human cells that contain a large number of mitochondria.

Mitochondria are known as the powerhouses of the cell because they generate adenosine triphosphate (ATP), the energy currency essential for many cellular processes. Muscle cells require a significant amount of energy to facilitate contraction and sustain physical activity, which is why they possess a high density of mitochondria.

In cardiac muscle cells, the abundant mitochondria enable the heart to function continuously and efficiently, while in skeletal muscle cells, the number of mitochondria can increase with prolonged exercise or training, enhancing their energy-producing capacity. This adaptation is crucial for maintaining endurance and performance in response to increased physical demands.