Cellular respiration


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  • Hello, and welcome to my YouTube channel! Today, I will be talking about cellular respiration!
  • Cellular respiration is an aerobic process, meaning that it needs energy to take place. Glycolysis, the first step of cellular respiration, is anaerobic, meaning that oxygen is not needed.
  • First, cellular respiration is a process that releases chemical energy from sugars and other carbon based molecules to make ATP when oxygen is present. This takes place in the mitochondria of our cells.
  • The 3-carbon based molecules from glycolysis enter respiration in the mitochondria's matrix. This process is called the Krebs cycle. Here ATP molecules are made and carbon dioxide is given off as a waste product.
  • Glycolysis splits glucose into 2 3-carbon molecules and makes 2 molecules of ATP.
  • The energy is transferred to a chain of proteins in the inner membrane of the mitochondria. Here a large number of ATP molecules are made.
  • Energy-carrying molecules then transfer energy to stage 2, the electron transport chain.
  • Oxygen then enters the process and is used to make water molecules. Water and heat are then given off as waste products.
  • Cellular respiration is an aerobic process. When oxygen isn't available, the anaerobic process of fermentation occurs.
  • In fermentation, pyruvate and NADH from glycolysis enters. 2 NADH molecules provide energy to convert pyruvate into lactic acid. As the NADH is used, it is converted back into NAD+. 2 molecules of NAD+ are then recycled back to glycolysis.
  • I hope that this video has helped some of you. If you have any questions please comment them below. Bye!
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