<prompt> The maintenance of posture in a normal adult human being depends upon:Integrity of reflex arcMuscle powerType of muscle fibersJoint movements in physiological range  <response>: A i.e. Integrity of Reflex arcPostural Reflexes not only maintain the body in an upright balanced position but also provide the constant adjustments necessary to maintain a stable postural background for voluntary activity- Ganong 22V207Integrity of the postural reflex arc is therefore the single best answer of choice. 