Describe the different types of secretions of a small intestine.
Answers
Secretions
The small intestine receives secretory products from other abdominal viscera. Here, we shall look at the exact mechanism of their secretion, and how they aid intestinal function.
There are three main substances that the small intestine receives: bile, pancreatic enzymes and alkaline juice (HCO3–). Bile serves an important role in lipid digestion, and is secreted from the gallbladder into the common bile duct, in response to CCK. Pancreatic enzymes and alkaline juice are secreted from the pancreas into the pancreatic duct, in response to CCK and secretin.
Further information on the production of bile can be found here.
The common bile duct and pancreatic duct unite to form the hepatopancreatic ampulla (also known as the Ampulla of Vater). This opens out onto the internal surface of the duodenum, and is marked by the major duodenal papilla.
The major duodenal papilla serves as an important anatomical landmark, as it is where the embryonic foregut becomes midgut. The secretions into the small intestine are regulated by the sphincter of Oddi.
By Biliary_system.svg: Vishnu2011 derivative work: Vishnu2011 (Biliary_system.svg) [Public domain], via Wikimedia Commons
Fig 3 – The biliary system with the landmarks.
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