Biology · Respiration
During a cross-country race, a marathon runner experiences muscle cramps in their legs toward the end of the race, despite having an adequate supply of glucose. The coach suggests that the runner's muscles have shifted to anaerobic respiration. Which of the following is the most immediate reason for this shift and the subsequent cramping?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The demand for oxygen by the muscle cells exceeds the supply provided by the circulatory system.✓
- 2Excessive intake of water diluting the blood's glucose concentration.
- 3The exhaustion of all ATP stores, forcing the muscles to use fat reserves directly.
- 4The accumulation of ethanol in the muscle cells due to incomplete breakdown of pyruvic acid.
Correct answer
The demand for oxygen by the muscle cells exceeds the supply provided by the circulatory system.
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