Recall the function of mitochondria.

The mitochondria, often referred to as the "powerhouse of the cell", have several functions, but their main function is to produce energy. Here's a step-by-step breakdown of how they do this:

1. The process begins when the food we eat is broken down into its basic components: proteins into amino acids, fats into fatty acids, and carbohydrates into sugars.

2. These components are then transported into the mitochondria.

3. Once inside the mitochondria, these components undergo a process called the citric acid cycle (or Krebs cycle). This process breaks down the components further, releasing energy in the form of a molecule called adenosine triphosphate (ATP).

4. ATP is then used as a source of energy for many of the cell's functions.

In addition to energy production, mitochondria also have other functions. They play a role in cell signaling, cellular differentiation, cell death, as well as the control of the cell cycle and cell growth.