The importance of proteins for the body

The importance of proteins for the human body is enormous. At the same time, they represent the body's "only source of nitrogen".

Full functions:
 * building - collagen, elastin;
 * motor - actin, myosin;
 * informational - protein hormones;
 * defensive - immunoglobulins, complement, antigens;
 * transport - albumin, enable catalysis (enzymes) and others.