Talk about the heterogeneity of the rhabdomyocytes

-Red fibers with slow contraction: smallest diameter, rich in myoglobin mitochondria and oxidative enzymes of aerobic pathways, easily produce ATP and slowly degrade it, contract slowly and resistant to fatigue -White fibers with fast contraction: Large pale cells with a small amount of myoglobin and mitochondria, and high glycogen content, producing ATP anaerobically and degrade it rapidly making fast irresistant to fatigue contractions -Red fibers with fast contractions: Red cells with intermediate size containing many myoglobins and mitochondria, produce ATP through oxidative phosphorylation and degrade it rapidly making fast contractions and resistant to fatigue but lesser than red with slow. They all exist in the skeletal muscle but in different compositions