Respiration

Respiration - Energy Breakdown Cellular respiration breaks...

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Energy Breakdown Cellular respiration breaks down energy-rich molecules to CO2 and water removing their energy First part of cellular respiration o Occurs outside the mitochondria o Partial break-down of glucose in glycolysis - only possible to completely break these down in mitochondria if oxygen is present Glycolysis and fermentation under anaerobic conditions o Alcohol fermentation By yeasts and bacteria Used for the conversion of hexose sugars to ethanol as biofuel - sugar cane sucrose, corn starch, or cellulose o Lactic acid fermentation other fungi and bacteria as well as in muscles
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Fermentation vs oxidative respiration o Slow-twitch oxidative fibers Yields much more energy Contain more mitochondria o Fast-twitch glycolytic fibers Used mostly in glycolysis that is quick Does not provide a lot of energy Macromolecules other than glucose can enter cellular respiration at different points o Carbohydrates - yield energy quickly o Fats - can provide sustained energy for extended exercise o Proteins are typically only used for energy during starvation periods Sugars are broken down in several steps starting with glycolysis in the cytosol
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This note was uploaded on 07/06/2009 for the course EBIO 1210 taught by Professor Demmig-adam during the Fall '07 term at Colorado.

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Respiration - Energy Breakdown Cellular respiration breaks...

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