Which process occurs in the mitochondria?

The Krebs cycle, also known as the citric acid cycle or TCA cycle, occurs in the mitochondria. This process is a crucial part of cellular respiration, which takes place after glycolysis. During the Krebs cycle, acetyl-CoA, derived from carbohydrates, fats, and proteins, is oxidized to produce energy carriers like NADH and FADH2, which are essential for the electron transport chain. The cycle also generates carbon dioxide as a byproduct, which is subsequently expelled from the cell and organism.

The role of mitochondria in cellular respiration is significant because they are often referred to as the "powerhouses" of the cell, providing the energy needed for various cellular functions. While glycolysis takes place in the cytoplasm, the Krebs cycle and the following electron transport chain are specific to the mitochondrial matrix and inner membrane, respectively. This compartmentalization is vital for the efficiency of energy production in eukaryotic cells.