What role does protein play in muscle repair?

Protein is essential for muscle repair because it supplies the amino acids that are the building blocks of muscle tissue. When muscles undergo stress during exercise, particularly resistance training, small tears occur in the muscle fibers. This is a normal process that ultimately leads to muscle adaptation and growth.

To repair these tears and make the muscle more robust, the body requires an adequate intake of protein. The amino acids derived from dietary protein are utilized in the synthesis of new muscle proteins, a process known as muscle protein synthesis. This not only helps in repairing damaged tissues but also in building new muscle fibers, leading to increases in muscle strength and size over time.

While protein also plays various other roles in the body, such as forming enzymes and hormones and supporting other physiological functions, its most critical role in the context of muscle repair and growth is providing the necessary amino acids. Thus, the correct answer highlights the vital role protein plays in facilitating these repair processes and promoting muscle hypertrophy.