Segmentation is the predominant contractile pattern in the small intestine during digestion. The primary physiological function of segmentation is to:

• A Mix chyme with digestive secretions and maximize mucosal contact ✓
• B Propel chyme aborally toward the colon
• C Relax the lower esophageal sphincter
• D Initiate the migrating motor complex

Explanation

Segmentation consists of stationary ring-like contractions spaced along the small intestine that divide and reunite chyme repeatedly. This mixes chyme with pancreatic and biliary secretions and brings nutrients into contact with the absorptive mucosa. Peristalsis, not segmentation, propels chyme aborally. The migrating motor complex occurs during fasting, not during the digestive phase.

Reference: Ganong's Review of Medical Physiology, 26th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.