Question

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Answer 1

HINGE JOINTS

Hinge joints allow straightening, bending and flexing of joints. For example, flexing of a finger or a toe. The bones in hinge joints are covered with a protective cartilage and a thick fluid known as synovial fluid. This fluid helps in lubricating the bones, making them move without much friction.

BALL AND SOCKET JOINTS

The smooth joint, with a hemispherical head that fits within a cuplike depression is called the ball and socket joint. This type of joint helps in rotational or circular movements, as one bone is captivated into the hollow space of another bone. This is the most freely moving joint.

PIVOT JOINTS

A pivot joint permits movement of the bones in one plane, such as rotation around a single axis. In the human body, the joint of the wrist that lets the palm of the hand move up and down is possible because of pivot joints.

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