Which of the following is true regarding joints that are first-class levers?
A. The joint (fulcrum) is at the opposite end from the tendinous attachment (effort).
B. Their resistance is between the joint (fulcrum) and the distal end of the bone (effort).
C. Their mechanical advantage is always less than 1.0.
D. Their mechanical advantage may be either greater or less than 1.0.
E. Their output force is always greater than the input force.
Answer: D
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