What is the role of protein in strengthening the musculoskeletal system?

• A. It provides amino acids for growth, repair, and maintenance of muscles and bones.
• B. It is the primary fuel for brain function.
• C. It stores calories as fat for insulation.
• D. It directly carries oxygen in the blood.

Answer: (A)

Proteins provide the building blocks for muscle and bone. They supply amino acids—the essential ingredients the body uses to grow, repair, and maintain skeletal muscles and bone tissue. When you train, tiny tears occur in muscle fibers; the body repairs these with new proteins, which helps muscles become stronger. In bones and connective tissue, proteins like collagen form the matrix that gives strength and structure, and this matrix is continually renewed using amino acids from protein intake. So, protein’s main role here is to supply the components needed for tissue synthesis and maintenance, which underpins the strengthening of the musculoskeletal system.

The brain’s main fuel is glucose, not protein; fats store energy as caloric reserves; and while proteins can be involved in oxygen transport (as part of hemoglobin), that function is not what strengthens muscles and bones.