Achild is born with a rare disease in which mitochondria are missing from certain skeletal muscle cells. physicians find that the muscle cells function. not surprisingly, they also find that

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Your question: A child is born with a rare disease in which mitochondria are missing from certain skeletal muscle cells. physicians find that the muscle cells function. not surprisingly, they also find that .

Your  A child is born with a rare disease in which mitochondria are missing from certain skeletal muscle cells. physicians find that the muscle cells function. not surprisingly, they also find that the muscles contain large amounts of lactic acid following even mild physical exercise.

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The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)