While doing sigmoidoscopy, if the rectum is inflated with a gas increased peristalsis is seen in: (A) Whole colon, (B) Proximal colon, (C) Distal colon, (D) Whole intestine
Answer is C. Increase in intrarectal pressure initiates defecation reflex, so peristalsis increases in distal colon Ref: Ganong 25th ed/page 499