Drug X inhibits acetylcholinesterase in the neuromuscular junction. Which effect would 
drug X have on the membrane potential of the muscle fiber? 
Drug X would decrease the frequency of action potentials in the muscle cell. 
Drug X would hyperpolarize the muscle cell. 
Drug X would make the muscle cell repolarize more quickly than normal. 
Drug X would prolong the depolarization of the muscle cell. 
Drug X would prolong the absolute refractory period of the muscle cell.