Which of the following are functions of protein within the human body?

Protein serves several critical functions in the human body, and one of the primary roles is to contribute to the structure of bodily tissues. Proteins are made up of amino acids and are essential for building and repairing tissues, including muscles, bones, skin, and organs. Collagen, for instance, is a protein that provides support and structure to connective tissues, while enzymes, which are also proteins, facilitate biochemical reactions necessary for various bodily functions.

In addition to structural roles, proteins play a vital part in numerous physiological processes, such as hormone production and immune function. However, when considering the options provided, the structural aspect is the most direct and significant function of protein.

While proteins can be used as an energy source, they are not the body’s primary energy source; carbohydrates and fats serve that role more efficiently. Likewise, proteins do not play a direct role in the regulation of blood glucose; instead, that function is more closely related to hormones like insulin. Finally, fat storage is primarily the function of lipids, not proteins. Therefore, attributing the structural role of proteins to option B effectively captures the essence of their importance in the human body.