While doing sigmoidoscopy, if the rectum is inflated with gas, increased peristalsis is seen in
Defecation reflex - When the rectum is distended, a reflex propulsive movement from descending colon to rectum occurs. Along with that, the internal anal sphincter relaxes. The same happens when the rectum is distended by gas.
Whole colon
Proximal colon
Distal colon
Whole intestine