If a muscle crosses a joint posteriorly,what action would it most likely have?

Question

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If a muscle crosses a joint posteriorly, it is most likely involved in extending or straightening the joint, which is the action associated with extension. Flexion (A) would be associated with a muscle that crosses anteriorly, while protraction (B) and right lateral flexion (D) are movements associated with certain joints, but not necessarily with muscles that cross posteriorly.

If a Muscle Crosses a Joint Posteriorly,what Action Would It