What biological functions do proteins have?

Proteins are complex high molecular weight natural compounds built from amino acids. The composition of proteins includes 20 different amino acids, hence a huge variety of proteins with different combinations of amino acids. The human body contains up to 100,000 proteins. Proteins in our body perform the following functions: 1) Energy – supply the body with energy; 2) Plastic – cell material (collagen); 3) Motor – all types of movement (myosin); 4) Signal – proteins – receptors transmit signals; 5) Transport – carry various substances (hemoglobin); 6) Protective – neutralize foreign substances (globulin); 7) Catalytic – enzymes.