- A Myofibril
- B Sarcomere
- C Muscle fibre
- D Actin filament
Correct answer: B. Sarcomere
Explanation: The sarcomere is the functional unit of muscle contraction. It extends from Z disc to Z disc and contains interdigitating thick (myosin) and thin (actin) filaments that slide past each other during contraction.
Concept context
Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.