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