Which nervous system provides an inhibitory effect that helps with continence in the GI tract?

Which nervous system provides an inhibitory effect that helps with continence in the GI tract?

• A. Parasympathetic nervous system
• B. Autonomic nervous system
• C. Sympathetic nervous system
• D. Central nervous system

Answer: (C)

Sympathetic division of the autonomic nervous system provides inhibitory control over the GI tract. It slows down gut motility and reduces secretions, while increasing internal anal sphincter tone. This combination helps maintain continence by limiting propulsion of contents and keeping the internal sphincter contracted. In contrast, the parasympathetic system promotes peristalsis and relaxes the internal anal sphincter, which would favor defecation rather than continence. The central nervous system is involved in overall regulation, but the specific inhibitory effect that supports continence here is driven by sympathetic input, making it the best fit.

Sympathetic division of the autonomic nervous system provides inhibitory control over the GI tract. It slows down gut motility and reduces secretions, while increasing internal anal sphincter tone. This combination helps maintain continence by limiting propulsion of contents and keeping the internal sphincter contracted. In contrast, the parasympathetic system promotes peristalsis and relaxes the internal anal sphincter, which would favor defecation rather than continence. The central nervous system is involved in overall regulation, but the specific inhibitory effect that supports continence here is driven by sympathetic input, making it the best fit.