When do you know you have to go to the bathroom?

When stool reaches the sphincter, we feel 'pressure' and recognize we need to have a bowel movement. For urination, it is a combination of the central nervous system and bladder wall stretching that cause our ability to recognize the urge to urinate.
When stool reaches the sphincter, we feel 'pressure' and recognize we need to have a bowel movement. For urination, it is a combination of the central nervous system and bladder wall stretching that cause our ability to recognize the urge to urinate.