Zelda is a marathon runner. She completes the marathon in 2 hours and 30 minutes. Which of the following is true regarding her fuel use during the marathon?
A. If she runs out of muscle glycogen at the 2-hour mark, she will not feel fatigue.
B. Anaerobic glucose breakdown, using muscle glycogen, will provide most of the ATP for the marathon.
C. Liver glycogen is the preferred fuel during intense muscular activity lasting less than 2 hours.
D. As exercise duration increases beyond 20 to 30 minutes, blood glucose will become increasingly important to spare muscle glycogen, so Zelda will have the ability to sprint across the finish line.

Question

15-12-2021
Biology

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Zelda is a marathon runner. She completes the marathon in 2 hours and 30 minutes. Which of the following is true regarding her fuel use during the marathon?
A. If she runs out of muscle glycogen at the 2-hour mark, she will not feel fatigue.
B. Anaerobic glucose breakdown, using muscle glycogen, will provide most of the ATP for the marathon.
C. Liver glycogen is the preferred fuel during intense muscular activity lasting less than 2 hours.
D. As exercise duration increases beyond 20 to 30 minutes, blood glucose will become increasingly important to spare muscle glycogen, so Zelda will have the ability to sprint across the finish line.

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luisvaschetto luisvaschetto · Answer 1 · 2021-12-20T09:41:43+01:00

As exercise duration increases beyond 20 to 30 minutes, blood glucose will become more important to spare glycogen. This substance (glycogen) serves as a form of energy storage.

Glycogen is a polysaccharide composed of many glucose subunits that serve as a form of energy storage.

Consuming foods rich in simple carbohydrates (e.g., glucose) before a marathon may be helpful in order to maintain normal levels of glucose in the blood and top off the stores of glycogen.

It has been shown that the first 30 minutes of a marathon is the most effective period to replenish glycogen stores.

Learn more about glucose here:

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