Fatty acids are normally oxidized in the mitochondria, specifically in the mitochondrial matrix.

Here's a breakdown:

* Mitochondria: These are the "powerhouses" of the cell, responsible for generating ATP (adenosine triphosphate), the primary energy currency of the cell.

* Mitochondrial Matrix: This is the innermost compartment of the mitochondria, where the enzymes responsible for fatty acid oxidation are located.

The process of fatty acid oxidation, also known as beta-oxidation, involves a series of enzymatic steps that break down fatty acids into two-carbon units (acetyl-CoA). These units then enter the citric acid cycle (Krebs cycle) to produce more ATP.