A student lifted weights after school and found that his muscles started to burn. He couldn’t continue to lift the weights after prolonged exercising. This muscle fatigue is most likely due to
(1)the heart beating too fast and tiring out
(2)the lungs accumulating oxygen
(3)lack of oxygen and build up of waste in the muscles
(4)lack of carbon dioxide in the muscles
(1)the heart beating too fast and tiring out
(2)the lungs accumulating oxygen
(3)lack of oxygen and build up of waste in the muscles
(4)lack of carbon dioxide in the muscles