What is the primary function of mitochondria in a cell?

Mitochondria are known as the powerhouses of the cell primarily because their main function is to produce adenosine triphosphate (ATP) through the process of cellular respiration. This process involves breaking down glucose and other nutrients in the presence of oxygen and converting them into ATP, which is the energy currency of the cell. ATP is essential for various cellular activities, making mitochondria vital for energy production.

In addition to ATP production, mitochondria play roles in other important processes such as regulating metabolic activities, apoptosis (programmed cell death), and maintaining cellular homeostasis. However, their principal role is undeniably connected to energy production, emphasizing their importance in sustaining life and supporting cellular functions.