1 Objective: Outline what enters and leaves each step of cellular respiration. YOUR CELLS GET ENERGY THROUGH 4 STEPS: #1 GLYCOLYSIS: GLUCOSE IS CONVERTED INTO PYRUVIC ACID. #2 PYRUVIC ACID CONVERTED INTO ACETYL-COA. #3 ACETYL-COA ENTERS THE CITRIC ACID CYCLE. NADH and FADH2 (BUS) LEAVES THE CITRIC ACID CYCLE. #4 NADH ENTERS ELECTRON TRANSPORT CHAIN. ATP (ENERGY) LEAVES THE ELECTRON TRANSPORT CHAIN.