Following the neck, an athlete spreads out his/her arms and makes big wide circles. Which kind of structural arrangement in the shoulders allows such movement?

Ball and Socket joint

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Pivotal joint

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Hinge joint

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Fixed joint

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Solution

The correct option is A
Ball and Socket joint

Ball and socket joints are a special class of joints that enjoy the highest freedom of motion in the body. The shoulder and hip joints are the only ball-and-socket joints in the human body.
Two main components make up a ball-and-socket joint: a bone with a spherical head and a bone with a cup-like socket. In the shoulder joint, the spherical head of the upper arm bone fits into the cavity of the shoulder blade.

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