Several muscles cross the shoulder joint. What describes the actions of these muscles as you lift your arm at the shoulder joint?
a.
All of the muscles contract, but to different extents.
b.
All of the muscles contract equally.
c.
Some of the muscles contract, while other muscles relax.
d.
Some of the muscles contract, while other muscles detach from the bones.
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Several muscles cross the shoulder joint. What describes the actions of these muscles as you lift yo...
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