During periods of prolonged exercise, muscles burn fat released from adipocytes in addition to glucose. Explain howthe need for additional fatty acids by muscle is communicated to the adipocytes.

How many ATP are produced from the complete degradation of G3P using glycerol- three phosphate shuttle?

If glucose was no longer available, pyruvate processing activity would:   a. decrease   b. increase   c. remain the same

Unlike a rabbit, running all-out for a few moments to escape a predator, migratory birds require energy for extended periods of time. For example, ducks generally fly several thousand miles during their annual migration. The flight muscles of migratory birds have a high oxidative capacity and obtain the necessary ATP through the oxidation of acetyl-CoA (obtained from fats) via the citric acid cycle. Compare the regulation of muscle glycolysis during short-term intense activity, as in a fleeing rabbit, and during extended activity, as in the migrating duck. Why must the regulation in these two settings be different? Extended activity requires the highly efficient anaerobic metabolism of fats, rather than the less efficient aerobic metabolism of glucose. Extended activity requires the highly efficient aerobic oxidation of fats, rather than the less efficient anaerobic metabolism of glucose. Extended activity stimulates glycolysis because the concentrations of citrate and acetyl-CoA are…