Review Question - QID 211524

A 42-year-old male presents to the ED after injuring his right arm while moving a solid wood dresser. He reports trying to put the dresser down when it slipped forcing his arm into extension. He then heard a “pop” and had pain and weakness in his right arm. On examination, he has mild swelling about the antecubital fossa, prominence of the biceps muscle belly, and a abnormal hook test. Which of the following properly describes the mechanism of contraction that most commonly leads to this patient’s pathology?