Study Qstns lecture 17-21

Study Qstns lecture 17-21 - Study Questions: Lecture 17-19...

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Study Questions: Lecture 17-19 Exercise Metabolism What hormone is responsible for regulating glucose uptake at rest and following a meal? Insulin What accounts for the increase in glucose uptake with exercise? Glucose needs to be utilized as another source of energy. Fat is the primary source during rest and light exercise. What organ is responsible for maintaining blood glucose levels? Liver, pancreas What is the source of the glucose? Glycogen is broken down. Why is it important to maintain blood glucose levels? Glucose is the primary source of energy for the brain. Is there another reason? What can one do during exercise to assist in maintaining blood glucose levels? Eat? What is the importance of having three energy pathways: immediate, anaerobic metabolism, aerobic metabolism. Different sources are for different types of activities. It depends on the exercise parameters: intensity, duration, nutrition, training state What are the primary energy sources used during high intensity short duration exercise? ATP stores/Creatine phosphate > carbs > fat Glycogen phosphorylase is regulated by both covalent modification and allosteric effectors. Describe how covalent modification effects phosphorylase activity? What are the allosteric effectors? Muscle contraction stimulates calcium release, which stimulates phosphorylase kinase. Exercise produces a higher level of AMP, which inihibits phosphorylase phosphatase (the enzyme that converts phosphorylase a back into the inactive phosphorylase b). Covalent modification activates phosphorylase from its inactive form. What is the role of membrane transporters? Name 2 transporters that are recruited to the plasma membrane of the muscle fiber during exercise. GLUT-4 facilitates the diffusion of glucose into the cell membrane. Membrane transporters allow the passage of molecules into the cytosol from the bloodstream. What account for the increase in FFA concentration in the blood following the onset of exercise? The following hormones are increased during exercise, which increases lipolysis
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Study Qstns lecture 17-21 - Study Questions: Lecture 17-19...

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