Question

Question #d1fbd

Answer 1

Because the rate of anaerobic respiration slows down comparatively.

Explanation:

During race, the muscles carry out anaerobic respiration along with aerobic respiration. Anaerobic respiration(in the absence of oxygen) results in the incomplete breakdown of glucose into lactic acid. Muscles can't afford lactic acid to reside in them for long time.
Thus, towards the end of race, due to apt oxygen supply the muscles start to oxidize the lactic acid into `CO_2` and `H_2O` releasing`ATPs`. And hence the rate of anaerobic respiration is reduced thus less lactic acid is produced.