1.Gastrin is secreted by endocrine cells into the stomach. This happens as soon as food appears. Acetylcholine is a neurotransmitter for the parasympathetic nervous system, so it stimulates muscle contractions and excites nerves. Cholecystokinin (CCK) is used for digesting fats. It stimulates the release of enzymes from the pancreas and causes contractions of the gall bladder. Secretin neutralizes acid from the stomach by stimulating the pancreas & bile ducts to release a bicarbonate base.
2. The gastrocolic reflex helps the body move the meal through. It stimulates the colon to pass the previous meal and get ready for the next.
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