Answer: Hinge.
- A Ball and socket
- B Hinge
- C Pivot
- D Gliding
Correct answer: B. Hinge
Explanation: The knee is a hinge joint that allows movement in one plane (flexion and extension). Other hinge joints: elbow, ankle, finger joints. Ball and socket joints (hip, shoulder) allow movement in all planes.
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.