Cisapride enhances gastrointestinal motility by:
A. Activating serotonin 5-HT4 receptor
B. Activating muscarinic M3 receptor
C. Blocking dopamine D2 receptor
D. All of the above
A. Activating serotonin 5-HT4 receptor
B. Activating muscarinic M3 receptor
C. Blocking dopamine D2 receptor
D. All of the above