Proteins

• biological catalysts are proteins
• many reactions requiring extremely high temps and days to complete are completed in an instant b/c of these

• these serve as source of amino acids for embryos and infants
• ex: egg albumin and casein in milk

• specific protein molecules produced b specialized cells of the immune system in response to foreign anitgen.
• These foreign invaders include bacteria and viruses

• carry material from one place to another in the body. Thr protein transferrin transports iron from the liver to the bone marrow.
• Hgb and myoglobin are involved in the transport and storage of oxygen

• control many aspects of cell frunction, including metabolism and reproduction
• many of the hormones that regulat body function are proteins (insulin)

• provide mechanical support and provide for out covering
• our hair and fingernails are largely composed of the protein keratin

our muscles including heart, contract and expand through the interaction of actin and myosin proteins- cilia, flagella