During high‑intensity exercise, which statement describes lactate production?

• A. Oxygen is required for lactate production
• B. Lactate production does not occur during sprinting
• C. Glucose is broken down to lactate without oxygen
• D. Lactate production only happens in trained athletes

Answer: (C)

During intense effort the muscle’s demand for energy outstrips the available oxygen, so the body relies on anaerobic glycolysis. In this pathway, glucose is broken down to ATP without using oxygen, and pyruvate is converted to lactate to regenerate the NAD+ needed to keep glycolysis running. That’s why lactate production is described as glucose being broken down to lactate without oxygen. Oxygen isn’t required for lactate formation, sprinting does produce lactate, and lactate can be produced by anyone, not just trained athletes.