Here's a breakdown of what that means:

* Cellular Respiration: This is the process by which cells break down glucose (sugar) in the presence of oxygen to produce energy in the form of ATP (adenosine triphosphate). This energy is then used to power all the cell's activities.

* Mitochondrial Role: Mitochondria are often called the "powerhouses of the cell" because they are the organelles responsible for carrying out this critical process. They have their own DNA and ribosomes, further highlighting their importance in energy production.

Let me know if you'd like more details about the process of cellular respiration!