Answer: Femur.
- A Femur
- B Humerus
- C Tibia
- D Sternum
Correct answer: A. Femur
Explanation: The femur (thigh bone) is the longest, strongest and heaviest bone in the body.
A sarcomere (Z line to Z line): during contraction the I band and H zone shorten as thin filaments slide over thick, while the A band stays the same length. Image: SlothMcCarty, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.