Which of the following is an example of a first-class lever system ?
Extension at Elbow
In a first-class lever the fulcrum (axis) lies between the effort (force) and the resistance (load).
In elbow extension the triceps pulls on the olecranon process behind the elbow joint, the joint is the axis, and the forearm and hand carry the resistance in front, so the axis lies between effort and resistance.
Elbow flexion by the biceps and knee flexion and extension place the muscle attachment between the axis and the load, which makes them third-class levers.
Hence, Extension at Elbow.
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