Surgery Which of the following events accompanies the rapid voluntary flexion of the arm? A An increase in the activity of the Ia afferent fibers from the biceps (the agonist) B A decrease in the activity of the Ib afferent fibers from the biceps (the agonist) C An increase in the activity of the Ia afferent fibers from the triceps (the antagonist) D A decrease in the activity of the Ib afferent fibers from the triceps (the antagonist) 💡 Explanation Which of the following events accompanies the rapid voluntary flexion of the arm? ✓ Correct Answer: C. An increase in the activity of the Ia afferent fibers from the triceps (the antagonist)