Question

the build-up of ______ in your cells occurs in conjunction with muscle fatigue.

lactic acid

muscle fatigue

aerobic respiration

aerobic respiration

Explanation:

Muscle fatigue is associated with the accumulation of lactic acid. When muscles work anaerobically (without enough oxygen), lactic acid is produced. "Muscle fatigue" is the condition itself, not the cause. Aerobic respiration doesn't cause fatigue - related build - up, and anaerobic respiration is the process, not the substance that builds up. So the correct option is lactic acid.

Answer:

A. lactic acid