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. Powerpoint is hosted on www.worldofteaching.com e visit for 100’s more free powerpoints
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. This Powerpoint is hosted on www.worldofteaching.com - PowerPoint PPT Presentation
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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.
This Powerpoint is hosted on www.worldofteaching.comPlease visit for 100’s more free powerpoints
• 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.
• 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 called target 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.