AEROBIC RESPIRATION: THE MAJOR SOURCE OF ATP | principle in animal life 1 | Bs zoology semester
AEROBIC RESPIRATION: THE MAJOR SOURCE OF ATP
The glycolysis and fermentation are inefficient processes. Thus the end product of glycolysis (pyruvate) still contains large amount of energy. This energy can be released by further oxidation. Free oxygen accumulated in the atmosphere of the earth as a result of photosynthesis. Therefore, evolution of aerobic respiration took place in microorganisms and in the mitochondria. The evolution of aerobic respiration has made the organism efficient. It provides them powerful and efficient way of removing energy from nutrient molecules. Life would become slow without mitochondrial ATP production. Thus most of animals could.not have evolved.
The pyruvate is entered into Krebs cycle or citric acid cycle. The NADH goes to the electron transport chain. During aerobic metabolism, free oxygen accepts electrons and reduces to H₂O as follows: Pyruvate + O2 CO2 + H2O + 34ATP + heat energy
34 molecules of ATP are produced during this reaction. The aerobic respiration is organized into a number of reactions. Each reaction is catalyzed by a specific enzyme. There are two steps of aerobic respiration:
Krebs cycle
Electron transport chain
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