Which type of motor unit is of prime impoance in generating the muscle power necessary for the maintenance of posture?: (A) Low threshold, fatigue-resistant, (B) High threshold, fatigable, (C) Intrafusal, gamma controlled, (D) High threshold, high force
Answer is A. The low threshold for activation, fatigue-resistant motor units are the type active in postural control. Intrafusal muscle fibers do not contribute to force generation.