Question

1. According to the paper, what does lactate dehydrogenase (LDH) do and what does it allow to happen within the myofiber? (5 points)

2. According to the paper, what is the major disadvantage of relying on glycolysis during high-intensity exercise? (5 points)

3. Using Figure 1 in the paper, briefly describe the different sources of ATP production at 50% versus 90% AND explain whether you believe this depiction of ATP production applies to a Type IIX myofiber in a human. (5 points)

4. Briefly describe the differences between aerobic and anaerobic metabolism (10 points).

Answer all questions please
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Answer #1

Name:1.According to the paper, what does lactate dehydrogenase (LDH) do and what does it allow to happen within the myofiber?

a.LDH converts NADH + (H+) + pyruvate to lactate + (NAD+). More lactate is produced during heavy intense exercise because the rate at which ATP is used is high. This is done so that glycolysis could be maintained and regenerate

2.According to the paper, what is the major disadvantage of relying on glycolysis during high-intensity exercise

a.It yields much less ATP per glucosyl unit as compared to aerobic breakdown (theoretically 3 vs. 38 ATP/glucosyl unit). This is a problem because during long exercise, muscle performance can be limited due to the depletion of glycogen.3.Using Figure 1 in the paper, briefly describe the different sources of ATP production at 50% versus 90% AND explain whether you believe this depiction of ATP production applies to a Type IIX myofiber in a human.

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