DEFECATION Defecation is the process of elimination of feces from the rectum through the anus, involving coordinated neuromuscular activity of the colon, rectum, anal sphincters, and abdominal muscles. I. FACTORS AFFECTING DEFECATION Age – infants (reflex), elderly (↓ tone) Diet – fiber, fluids Fluid intake Physical activity Psychological factors – stress, anxiety Medications – opioids, anticholinergics, laxatives Diseases – IBS, IBD, spinal cord injury Position – squatting vs supine Habits & pr
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