How might a human muscle protein molecule differ from a cow muscle protein molecule?

Human muscle protein differ from a cow muscle protein molecule in the terms of number of mitochondria present, as in human number of mitochondria present is lesser than that of present in cow. Human muscles are not designed to do as much physical work as cows muscles are. Cow's muscles have more mitochondria so that they can generate ATP for physical activity without quickly defaulting to fermentation.  

6.4 cm (max) - 25 cm (min)