Which term describes the lactic acid production that builds up when oxygen stores are used, causing fatigue?

Which term describes the lactic acid production that builds up when oxygen stores are used, causing fatigue?

• A. Respiratory rate
• B. Tidal volume
• C. Residual volume
• D. Lactic acid production

Answer: (D)

During intense exercise, the body's need for energy can outpace the supply of oxygen for aerobic respiration. To keep making ATP, muscles switch to anaerobic glycolysis, which quickly breaks down glucose but produces lactic acid as a by-product. This lactic acid builds up when oxygen is limited, causing acidity, a burning sensation, and fatigue. The term that describes this production is lactic acid production. Breathing terms like respiratory rate, tidal volume, or residual volume describe how we move air in and out of the lungs, not how lactic acid is produced, so they don’t fit this scenario.

During intense exercise, the body's need for energy can outpace the supply of oxygen for aerobic respiration. To keep making ATP, muscles switch to anaerobic glycolysis, which quickly breaks down glucose but produces lactic acid as a by-product. This lactic acid builds up when oxygen is limited, causing acidity, a burning sensation, and fatigue. The term that describes this production is lactic acid production. Breathing terms like respiratory rate, tidal volume, or residual volume describe how we move air in and out of the lungs, not how lactic acid is produced, so they don’t fit this scenario.