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Respiration160-page5 - Cell Respiration 5 Following...

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Cell Respiration - 5 Following glycolysis, the presence of absence of oxygen, and/or the organism's ability to use oxygen in respiration, determines whether pyruvate will be oxidized to yield more energy in aerobic respiration or reduced to a stable molecule in the fermentations. We will discuss first what happens after Glycolysis when no oxygen is available – The Fermentations. Then we will discuss the processes involved in Aerobic Cellular Respiration The Fermentations – Cell Respiration in the Absence of Oxygen The overwhelming majority of living organisms must do aerobic cellular respiration to stay alive. Fermentations and other anaerobic pathways provide insufficient ATP to sustain life for most organisms. Yet, when no oxygen is available for aerobic cell respiration, eukaryotic organisms, and some prokaryotes, will complete glucose metabolism with the fermentation reactions. Fermentations are an alternative pathway for pyruvate after glycolysis occurs.
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