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.
Cristiano Ronaldo vs. Lionel Messi. Cristiano Ronaldo, a Portuguese footballer and striker for Real Madrid, and Lionel Messi, an Argentinean forward for Barcelona are two of the greatest footballers (soccer players) of our time. Ronaldo is the older of the two, has played in more games and scored more goals than Messi.