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אין תוצאות חיפוש עבור: results/If_muscles_are_subjected_to_long_periods_of_vigorous_activity_they_become_fatigued__ie_they_stop_contracting_efficiently.__If_insufficient_oxygen_is_reaching_the_muscles_they_use_anaerobic_respiration_to_obtain_energy.,3,0,7033;11319;11532,0,30,1,tn,1.html