The demands of exercise necessitate numerous physiological changes in animals, especially in circulation and muscle metabolism. Consider...

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Medical Sciences

The demands of exercise necessitate numerous physiologicalchanges in animals, especially in circulation and musclemetabolism. Consider prolonged exercise activity (e.g.long-distance migration or a marathon run in human exercise).
Describe the changing demands in muscle metabolism as exerciseprogresses (from seconds to minutes to hours). How will the fuelused by locomotory muscles change?
Describe the associated changes in respiration and circulationin order to meet the increased demand of skeletal muscle. Whatspecific changes in cardiac output and capillaries at the musclebed take place, and how are these regulated?

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Prolonged exercise activity like marathon running require a sustained and regular supply of energy to the skeletal muscles Since the two organ systems lnvolved inlong distance running are the cardiovascular and the locomotor systems the main physiological changes take place in these two To meet the muscles energy requirements the circulatory and respiratory systems have to work together In the beginning of any race the first 30 to 60 seconds the muscles rely on the phosphogenic pathway of energy production The breakdown of glucose from the blood or the stored glycogen in the muscles occurs by glycolysis without the use of oxygen But as the demand for energy increases the aerobic pathway becomes the chief energy source and fats dominate as the fuel Humans See Answer

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