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When a skeletal muscle contracts to cause a given movement, the more movable end of attachment of the muscle is termed its. origin. insertion. antagonist. synergist. When a muscle contracts, it usually has an opposing muscle that can cause movement in the opposite direction.
These are muscles where the origin (the attachment to a fixed bone, usually the proximal attachment) is wider than the point of insertion. This fibre arrangement allows for maximum force production. An example is Pectoralis Major. Convergent muscles are also sometimes known as triangular muscles.