Best Answer: The peripheral nervous system, which it is a component of. The sympathetic and parasympathetic systems are components of the autonomic nervous system.
Also, make the call if: 1  Constipation is a new problem for you. 2  You have blood in your stool. 3  You are losing weight even though you are not dieting.  You have severe pain with bowel 1  movements. Your constipation has lasted more than 2 weeks.  You have pencil-thin stools.
Senna for constipation (Potter's Senna, Senokot) Senna can take 8-12 hours to have an effect. It is best taken in the evening. If you are still constipated after taking senna for three days, make an appointment to speak with your doctor.