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Question

Which type of movement would have been possible if
1. our elbow had a fixed joint.
2. we were to have a ball and socket joint between our neck and head.


Solution

1. A fixed joint does not allow any movement. Thus, if our elbow had a fixed joint, we would not be able to bend/fold our arms.
2. A ball and socket joint allows movement in all directions. Thus, if we were to have a ball and socket joint between our neck and head, we would be able to rotate our head  360.

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