Important in repairing damage in muscle tissue (mainly) Made up of large molecules, carbon, Hydrogen, Oxygen, Nitrogen

• A. Carbohydrates
• B. Proteins
• C. Lipids
• D. Nucleic Acids

Answer: (B)

Proteins are the key builders for repairing muscle tissue. They’re large molecules made from carbon, hydrogen, oxygen, and nitrogen, arranged into chains of amino acids. In muscles, proteins like actin and myosin form the contractile fibers, while others such as collagen provide structural support, and various enzymes help accelerate the repair process. When muscle is damaged, the body increases protein synthesis to replace broken-down proteins, drawing on amino acids from the diet to build new proteins. Carbohydrates and lipids are important energy sources and are also macromolecules, but they don’t supply the nitrogen-containing building blocks needed for new tissue as directly as proteins do. Nucleic acids contain nitrogen too, but their main role is storing and transmitting genetic information, not directly rebuilding muscle fibers. So proteins are the most direct and essential for muscle repair.