A 42-Year-Old Weightlifter Is Preparing for an Upcoming Strength Competition

A 42-year-old weightlifter is preparing for an upcoming strength competition.  After lifting a series of progressively heavier weights, he decides to increase the weight on the exercise bar to 175 kg (385 lbs) , the heaviest lift he has ever attempted.  He is able to hold the weight over his head for several seconds.  However, his arms suddenly and involuntarily give way and he drops the weight to the ground.  Which of the following structures was most likely responsible for the sudden muscle relaxation?

A) A-delta nerve endings
B) Golgi tendon organ
C) Intrafusal muscle fibers
D) Pacinian corpuscles
E) Ruffini's end organs

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