<human>:  Explain the function of proteins in the body.
<bot>: Proteins are essential for the proper functioning of the human body. They play a major role in many vital processes, including cell growth and repair, energy production, digestion, muscle contraction and development of antibodies to fight off infections. Proteins are also important building blocks for bones, skin and other tissues. They help the body create hormones, enzymes and other molecules that have important regulatory functions. In addition, proteins aid in the transportation of oxygen, iron and other substances within the body and help stabilize the pH level of the fluids in the body.