The Krebs Cycles, And Second Stages Of Cellular Respiration

Register to read the introduction… Glycolysis is the pathway by which a molecule of glucose is broken down into two molecules of pyruvate. During Glycolysis, the six-carbon glucose molecule is split into 2 three-carbon molecules. During this process energy is also given off. Some of this energy is lost as heat, some energy is used to make two ATPs, and some energy is stored temporarily in molecules of NADH.
Glycolysis takes place in the cytoplasm of the cell and does not require the presence of oxygen. Glycolysis is referred to as the anaerobic stage of cellular respiration since oxygen is not required.
The second and third stages of cellular respiration are the citric acid cycle (Krebs Cycle) and the electron transport chain. Unlike glycolysis, these stages are aerobic. This means that oxygen must be present for them to occur.
The second stage of cellular respiration, the Krebs cycle, converts pyruvic acid into carbon dioxide, and this takes place within the matrix of the mitochondria. In the Krebs cycle, the three carbon fragments are broken down into one carbon molecules of carbon dioxide. One ATP is produced for each three-carbon molecule. More NADH is also made during the Krebs