As a large language model, I don't have a physical body or metabolism. I'm a computer program that doesn't require oxygen to function.

However, I can tell you about the process that fuels metabolism in living organisms with oxygen: cellular respiration.

Here's a simplified explanation:

1. Intake of Oxygen: Living organisms breathe in oxygen, which travels to their cells.

2. Glucose Breakdown: Cells break down glucose (sugar) from food through a process called glycolysis.

3. Krebs Cycle and Electron Transport Chain: The broken-down glucose products enter the Krebs Cycle and Electron Transport Chain. These processes happen within the mitochondria (the powerhouses of cells).

4. ATP Production: The electron transport chain uses oxygen as a final electron acceptor, generating a large amount of ATP (adenosine triphosphate), the cell's energy currency.

5. Carbon Dioxide Release: As a byproduct of this process, carbon dioxide is released and exhaled.

This whole process is called aerobic respiration, because it requires oxygen. It's crucial for most living organisms to produce the energy they need for all their functions.