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Gastrin,
a hormone produced by G cells in the stomach
and upper small intestine,
plays a pivotal role in digestion.Upon food intake,
gastrin stimulates the release of gastric acid (hydrochloric acid) by parietal cells in the stomach,
aiding in protein breakdown
and vitamin B12 absorption.Additionally,
gastrin influences gastric motility,
enhancing food mixing
and movement through the digestive tract.While essential for digestion,
excessive gastrin levels can lead to conditions like ulcers
and Zollinger - Ellison syndrome,
while insufficient gastrin can impair digestion
and nutrient absorption.
