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12 Cards in this Set
- Front
- Back
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Stored ATP and creatine phosphate provide energy for how long?
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Only for the first few seconds of vigorous activity
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After ATP and creatine phosphate have been depleted, what does the body use for fuel?
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Glycogen. Glycogen provides glucose for the glycolytic pathway.
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How long does glycogen supply energy for?
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several seconds to a few minutes
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Is gluconeogenesis activated during vigorous activity?
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No, takes too much time. Glycogen is used instead
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Are free fatty acids used during vigorous exercise?
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No, fat metabolism is slower than glycogen mobilization and is only used at lower exercise levels.
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What energy sources are utilized during a 100 meter sprint?
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Stored ATP, creatine phosphate, anaerobic glycolysis
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What energy sources are utilized during a 1000 meter run?
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Stored ATP (seconds), creatine phosphate (seconds), anaerobic glycolysis AND oxidative phosphorylation
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What energy sources are used while running a marathon?
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Glycogen and FFA oxydation; glucose conserved for final sprinting
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What are the priorities that the body has during fasting?
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To supply the brain with glucose and to preserve protein
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What are the 4 things that the body does to maintain glucose levels during the first 3 days of fasting?
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1. Hepatic glycogenolysis and glucose release
2. Adipose release of FFA 3. Muscle and liver shifting fuel use from glucose to FFA 4. Hepatic gluconeogenesis from peripheral tissue: lactate alanine adipose tissue glycerol propionyl-CoA from odd-chain FFA (the only triacylglycerol components that can contribute to gluconeogenesis) |
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How does the body maintain glucose levels after day 3 of starvation?
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Muscle protein loss is maintained by hepatic formation of ketone bodies, supplying the heart and brain.
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How does the body maintain glucose levels after several weeks of starvation?
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Ketone bodies become the main source of energy for the brain, so LESS muscle protein is degraded than during days 1-3.
Survival time is determined by the amount of fat stores. After this is depleted, vital protein degredation accelerated, leading to organ failure and death. |
