Which of the following is a primary function of proteins in the body?

• A. Energy storage
• B. Growth, maintenance, and repair of tissues
• C. Transport of oxygen
• D. Regulation of body temperature

Answer: (B)

Proteins play a critical role in the body, primarily functioning in the growth, maintenance, and repair of tissues. They are essential building blocks for muscles, skin, organs, and other tissues. Proteins are composed of amino acids, which are necessary for the synthesis of structural components like collagen and elastin, as well as enzymes and hormones that facilitate a vast range of biological processes.

While proteins can have secondary roles, such as acting as enzymes or facilitating communication within the body, their main function is centered around the structural integrity and vitality of the body’s tissues. This role is particularly important during stages of growth, recovery from injury, and regular maintenance of muscle mass and healthy organs.

In contrast, energy storage, transport of oxygen, and regulation of body temperature, while important processes in the body, are primarily associated with carbohydrates, hemoglobin (which is a specific protein but not a primary function of all proteins), and various physiological mechanisms (including fat and metabolic processes), respectively. Thus, the emphasis on proteins specifically highlights their fundamental roles in tissue dynamics.