Question

When an individual exercises vigorously for more than 15 minutes, the muscle cells are unable to obtain oxygen from the blood quickly enough. As a result, the muscle cells

a
pull oxygen through the skin in order to continue working.
b
send signals to the brain telling it to shut the muscles down.
c
start anaerobic respiration, producing lactic acid buildup.
d
stop functioning properly, resulting in death.

Answer 1

c
start anaerobic respiration, producing lactic acid buildup.