The reasoning: task‑matched motor programmes
- Peristaltic reflex (law of the intestine): distension → ascending excitation (ACh, substance P) oral to the bolus + descending inhibition (NO, VIP, ATP) aboral to it.
- Segmentation: non‑propagated, alternating ring contractions in the fed state — mixing and mucosal contact.
- Migrating motor complex (MMC): fasting "housekeeper" through stomach and small intestine; cycle ~90–120 min; phase III front associated with motilin peaks (gastric) and other controls (small bowel); abolished by feeding.