Discussion
The two joint muscle fibers cannot exert enough tension to shorten sufficiently to cause full ROM in both joints at same time is called .............................. .
Answer: D
This is active insufficiency.
A two-joint (biarticular) muscle crosses two joints. When it contracts to move both joints at once, it shortens so far that its fibres can no longer develop enough tension to complete the full range of motion at both. The hamstrings, for example, cannot fully flex the knee while the hip is fully extended.
Passive insufficiency is the opposite case: the two-joint muscle is stretched over both joints and cannot lengthen enough to allow full range at both, as when the hamstrings limit hip flexion with the knee straight. Biarticulate and multiarticulate only describe how many joints a muscle crosses.
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