Question

Ali is in a weight-lifting program for one hour a day several days a week. During his workout, each exercise lasts only a minute or so because of how difficult the work is. A few hours after exercise, he notices that his muscles are sore and slightly swollen. His muscle cells have experienced ______________ that led to production of _______________.

A. fermentation; alcohol
B. nitrogen fixation; water
C. anaerobic respiration; lactic acid
D. aerobic respiration; carbon monoxide

Answer 1

During strenuous exercise where the oxygen supply is limited, Ali's muscle cells undergo anaerobic respiration, leading to the production of lactic acid, which may cause muscle soreness.

Step-by-step explanation:

Ali's muscle cells have experienced anaerobic respiration that led to production of lactic acid. When his muscles were used to the point of fatigue and there wasn't enough oxygen supply for aerobic respiration, they switched to lactic acid fermentation, a form of anaerobic respiration. This process occurs in the muscles during strenuous exercise because oxygen cannot be delivered quickly enough, leading to a temporary accumulation of lactic acid, which is believed to cause muscle soreness and swelling after exercise.