What is one of the key roles of proteins in the body?

Proteins serve several critical functions in the body, and one of their key roles is making up major structural components. Proteins such as collagen and keratin form the basic structure of tissues, including muscles, skin, hair, and connective tissues. Collagen, for instance, is the most abundant protein in the body and provides strength and support to various tissues, while keratin contributes to the structure of hair and nails.

This structural role is essential for maintaining the integrity and function of organs and systems within the body. Unlike carbohydrates, which primarily serve as energy sources, proteins are pivotal in forming and repairing tissues, aiding in muscle contraction, and facilitating enzyme activity, among other functions.