Secretin and cholecytostokinin are produced and secreted by cells in the lining of the alimentary tract. Which of the following statements about these two substances is true?
(a) they are produced by the main cells of the stomach
(b) they are digestive enzymes produced by the duodenum
(c) they are produced by the paneth cells
(d) they are hormones that have target cells in the pancreas and biliary tract. They are produced by diffuse neuroendocrine cells (DNES cells)
(e) they are produced by Brunner glands and released into the lumina of the crypts of Lieberkuhn.
Answer: (d) they are hormones that have target cells in the pancreas and biliary tract. They are produced by diffuse neuroendocrine cells (DNES cells)
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