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This educational resource explores the role of the pancreas as an endocrine gland, focusing on its islets of Langerhans, which secrete crucial hormones like insulin and glucagon. We delve into how these hormones regulate blood glucose levels through negative feedback control mechanisms, highlighting the importance of homeostasis in mammals. Additionally, the advantages of using genetically engineered human insulin for treating diabetes are discussed. This PowerPoint presentation serves as a valuable tool for both teaching and learning about endocrine functions and hormonal regulation.
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Objectives • Explain what is meant by the term endocrine gland. • Describe the cellular structure of an islet of Langerhans from the pancreas. • Outline the role of the pancreas as an endocrine gland.
` http://www-medlib.med.utah.edu/WebPath/ENDOHTML/ENDO032.html
Pancreas • Exocrine Gland: a gland that secretes externally through a duct • Endocrine Gland: a gland that secretes hormones into the bloodstream.
Pancreas • The pancreas has an exocrine portion that secretes digestive enzymes that are carried through a duct to the duodenum. The endocrine portion consists of the pancreatic islets, which secrete glucagons and insulin.
Objectives • Explain how the blood glucose concentration is regulated by negative feedback control mechanisms, with reference to insulin and glucagon. • Discuss the importance of homeostasis in mammals, and explain the principles of homeostasis in terms of receptors, effectors and negative feedback.
Hormones • Most hormones circulate in blood, coming into contact with essentially all cells. However, a given hormone usually affects only a limited number of cells, which are calledtarget cells. A target cell responds to a hormone because it bears receptors for the hormone. • The effector is usually an organ.
Objectives • Explain the advantages of treating diabetics with human insulin produced by genetic engineering.
This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.