I'm here in the kitchen to find something to eat and get some energy. How do we get energy from food? Well, cellular respiration of course.
You see these two pieces food? Well cellular respiration breaks down the glucose and the food molecules and releases energy, with the help of oxygen of course . Let me tell you more
there are three steps of cellular respiration. the first one, glycolysis, breaks down sugars into pyruvate. This step takes place in the cytoplasm.
Then the Krebs cycle, the second step, generates energy (ATP, NADH, and FADH2) from the oxidation of Pyruvate. That takes place in the mitochondria. I know this is a lot but lets move on to the third step
The third step is electron transport chain (ETC). This process includes complexes found in the mitochondrial membrane accepting electrons from carriers and donors
The reactants of cellular respiration are oxygen and glucose, and the products are water, carbon dioxide, and energy. So there. whenever you think "Oh wow! that protein bar gave me a lot of energy", think of cellular respiration.