What is the primary function of proteins in the body?

The primary function of proteins in the body is to build and repair tissues. Proteins are made up of amino acids, which are the building blocks of body tissues, including muscles, skins, organs, and other structures. When the body undergoes physical stress, injury, or growth, proteins play a crucial role in the repair and synthesis of those tissues, ensuring proper function and health.

Although proteins can also provide some energy, especially under conditions where carbohydrates and fats are insufficient, their most vital role lies in their structural and functional contributions to the body. They are essential components of enzymes, hormones, antibodies, and cell membranes, contributing to a vast range of physiological processes beyond energy provision.

The transportation of oxygen in the blood is primarily the role of hemoglobin, which is a protein, but this does not encapsulate the full scope of protein functions across the body. Regulation of body temperature involves thermoregulatory mechanisms like sweating and heat generation by muscle activity, which are not directly related to the function of proteins. Hence, while proteins have various roles, their primary function is indeed building and repairing tissues.