After exercising the neck, an athlete exercises for the shoulder. He/she spreads out his/her arms and starts making big wide circles with them. Which kind of structural arrangement in the shoulders allows such movement?
A
Ball and socket joint
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B
Pivotal joint
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C
Hinge joint
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D
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 thanks to their unique structure. 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.