Question

Which one of the following is the thick filament of muscle?

• A. Actin
• B. Troponin
• C. Tropomyosin
• D. Myosin

Answer 1

The correct option is D Myosin

• Myofibril is made up of two types of filaments. They are thick filament (myosin) and thin filament (actin). Actin filaments are thinner as compared to the myosin filaments, hence are commonly called thin and thick filaments respectively
  
• Each myosin (thick) filament is a polymerized protein. Many monomeric proteins called meromyosins constitute one thick filament.
  
• Hence myosin is the thick filament of muscle.
• So, the correct answer is 'Myosin'.