zollinger-ellison syndrome. gastrinoma

zollingerellison syndrome zollinger ellison gastrinoma tumor cancer pancreas stomach peptic ulcer duodenum pancreatic ulcerogenic zes gastrin gastrointestinal hormone gastric disorder secreting acid hypersecretion imbalance endocrine system disease overproduction malignancy malignant scientific diagram healthy health medical science biology exam knowledge lesson explainer education biochemistry quiz instruction learning training schooling teaching zollinger-ellison syndrome developed caused ulcers duodenum human digestive system vector