What five proteins are contained in the blood? what are their functions?

School Assignment?: If yes - I spend enough time helping my kids to do their homework without doing your assignments for you. Check: http://en.wikipedia.org/wiki/Blood_proteins

More than 5: There are many more than 5 proteins found in the blood. I suppose you could base them in broader categories: Albumin, Fibrinogen and other clotting factors, Globulins, and regulatory proteins. Albumin provides oncotic pressure to the vascular system. Fibrinogen and associated clotting factors -self explanatory. Globulins are part of the immune system and regulatory proteins serve many fxns