HUMAN NUTRITION

Detailed explanation-1: -(a) Ball and socket joint is a movable joint. In this, a bone with a round head fits into the hollow space of another bone. This makes the bone to rotate freely. For example, bones of the hip and shoulder can move in all directions due to ball and socket joints.

Detailed explanation-2: -Freely moving joints Saddle joint – this permits movement back and forth and from side to side, but does not allow rotation, such as the joint at the base of the thumb. Hinge joint – the two bones open and close in one direction only (along one plane) like a door, such as the knee and elbow joints.

Detailed explanation-3: -A ball and socket joint allows greater movement as compared to a hinge joint. A typical hinge joint allows movement in a single plane such as backward, forward, down and up movements. A ball and socket joint, on the other hand, allows movement in all directions such as rotational movements.

Detailed explanation-4: -In ball and socket joint, one bone is hooked into hollow space of another bone. This type of joint helps in all directions and also rotatory movement. Eg: Shoulder.