2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)