Question

The anatomical unit of muscle is

• A. muscle fibre
• B. sarcomere
• C. filaments
• D. sutures

Answer 1

Answer: (A)

Myofibrils are assembled of repeated structures called sarcomeres (the smallest functional unit of muscle fibre). However, a single muscle cell has many myofibril (muscle fibre) units. Each sarcomere is composed of actin (called thin) and myosin (called thick) filaments, arranged in a precise order, and protein complexes that support the filament structures.