Anatomy and Cell Biology 3319 Lecture Notes - Lecture 41: External Anal Sphincter, Ontogeny, Inferior Mesenteric Vein
9 Jul 2018
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Digestive organs and accessory organs involved as well. Total length of around 6m, divided into 3 regions: duodenum (25cm, jejunum (2/5) The pancreas: lodged within the c shape of the duodenum. Is both an endocrine and an exocrine organ, with many exocrine acinar glands intermixed with fewer clusters of endocrine cells. Pancreatic juice with pancreatic enzymes: exocrine acinar cells secrete at least 22 kinds of pancreatic enzymes capable of digesting various categories of food. Cells secrete proteases as a zymogen granules: enzymes are stored within the cells as inactive zymogen granules, which become activated in the duodenum. Not active now and will become active later: the endocrine function is carried out by pancreatic islets (islets of langerhans), which secrete insulin (beta cells) and glucagon (alpha cells) The liver has more than 200 important functions; including: synthesis and secretion of bile, storage of glycogen and lipid reserves, nutrients picked up, synthesis and release of cholesterol bound to transport proteins.
