The role of the citric acid cycle, also known as the Krebs cycle, in cellular respiration is to facilitate the production of energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins. This cycle generates ATP, NADH, and FADH2, which are vital for the subsequent electron transport chain. The citric acid cycle also contributes to the synthesis of important biochemical precursors. Ultimately, it is essential for cellular energy metabolism and maintaining cellular function.