As illustrated here in the Krebs cycle diagram, the Krebs cycle happens in our cells across the inner membrane of the mitochondria — the organelles responsible for cellular power production. Cellular respiration is a multi-step process, starting with glycolysis, which breaks down the six-carbon ring of glucose and serves up these three-carbon molecules called pyruvic acids and two energy-rich compounds called NADH. It should be noted here that the Krebs cycle is an aerobic process that requires oxygen to work. So, when you make the Krebs cycle diagram, do not forget to mention the process of cellular respiration.
