Answer: Lubricate the joint, reduce friction, and absorb shock.
- A Carry nutrients directly into compact bone tissue
- B Lubricate the joint, reduce friction, and absorb shock
- C Form new cartilage at the articular surface
- D Attach muscle fibres firmly to the periosteum of bone
Correct answer: B. Lubricate the joint, reduce friction, and absorb shock
Explanation: Synovial fluid (secreted by the synovial membrane) lubricates articular cartilage surfaces, reducing friction. It also absorbs shock and provides nutrients to avascular cartilage. Loss of synovial fluid leads to painful joint movement.
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.