During a long-distance run, a 28-year-old athlete starts to feel fatigued due to the buildup of a particular metabolic byproduct. Which process is primarily responsible for this fatigue?
Q1. During a long-distance run, a 28-year-old athlete starts to feel fatigued due to the buildup of a particular metabolic byproduct. Which process is primarily responsible for this fatigue?
Answer: Lactic acid production
Explanation: Lactic acid accumulation in muscles leads to fatigue, as it interferes with muscle contraction and energy production.