What is the role of proteins in the body?

Proteins play a vital role in the body, serving numerous essential functions that support overall health and biological processes. They are fundamental components of all living cells and are involved in virtually every cell function. Proteins are made up of amino acids, which are necessary for the construction and repair of tissues, including muscles, organs, and skin.

Additionally, proteins serve as enzymes that catalyze biochemical reactions, aiding in metabolic processes, digestion, and energy production. They also function as antibodies in the immune response, helping the body to defend against pathogens. Furthermore, proteins are critical in the formation of hormones and other signaling molecules that regulate various physiological functions, including growth and development.

This comprehensive role highlights that proteins are crucial for not just growth, but for the maintenance of cellular functions and overall body effectiveness, which is why the correct answer encompasses the broad contribution of proteins to cellular functions and body growth.