Question

An elbow joint is an example of
A. Hinge joint
B. Gliding joint
C. Ball and Socket joint
D. Pivot joint

Answer 1

Hint: Joints are the places where two or more bones meet. Many of the joints are flexible, causing the bones to move. The joints are made of a few important parts like cartilage, Synovial membrane. Ligaments, tendons and synovial fluid.

Complete Answer:
- The elbow is a hinge joint consisting of three bones, the humerus, the ulna and the radius. The ends of the bones are bound by cartilage. The elbow is a joint that links the upper arm to the forearm. It is known as a hinge-type synovial joint. The alignment of the elbow joint bones produces a synovial joint style hinge, which enables the forearm to be stretched and bent.
- A gliding joint is a common type of synovial joint formed between bones. Gliding joints allow the bones to slide past each other in either direction along the plane of the joint—up and down, left and right, and diagonally.
- The ball-and-socket joint is a joint in which a bone's rounded surface passes to another bone within a depression, providing more freedom of mobility than any other form of joint.
- A pivot joint, also known as a rotary joint, is a freely rotating joint that only allows rotary motion along a single axis. Inside a ring that is created by a second bone, the moving bone rotates.

Note: Hinge joints, such as those in the fingertips, ankles, elbows, and toes, allow only bending and straightening motions. The bursa is a membranous sac packed with synovial fluid. It acts as a buffer to minimise tension between moving sections of the joint and to reduce degenerative damage. There are multiple bursae in the elbow, but only a handful have clinical significance.