1 Required for building and repair of body tissues (including muscle) 2  Enzymes, hormones, and many immune molecules are proteins.  Essential body processes such as water balancing, nutrient transport, and muscle contractions require protein to function.
Previous Game. Player Profile. A much-vaunted prodigy when snapped up by Manchester United from Sporting Lisbon in 2003, Ronaldo is now, alongside Lionel Messi, the best-known player on the planet, and a hero for Real Madrid and Portugal.
Manchester United have long harboured hopes that Ronaldo would return to Old Trafford one day but it appears as if he will head to the MLS, in what will be an unbelievable coup for the league. In January, Ronaldo's agent Jorge Mendes, said that after the winger's Real Madrid contract ends perhaps he will go to the US. Only God knows what will happen. While on a pre-season tour of the US in 2012, Ronaldo said that he hoped to play in the US one day.