What is the function of mitochondria in cells?

Mitochondria are often referred to as the 'powerhouses of the cell' because their primary function is to generate adenosine triphosphate (ATP), the energy currency of the cell, through a series of chemical reactions involved in cellular respiration^[1][3][5]. These organelles also play critical roles in various cellular functions, including calcium storage, regulation of metabolic activities, and apoptosis, which is the process of programmed cell death^[1][2][4].

In addition to energy production, mitochondria are involved in thermogenesis and cell signaling, influencing important cellular processes such as growth and differentiation^[2][5]. Their unique structure, including the inner and outer membranes, facilitates these diverse functions^[3][4].