Ch 45 %28doc%29 - Chapter 45 Slide 1 Hormones and the...

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Chapter 45 Slide: 1 Hormones and the Endocrine System Chapter 45 Slide: 2 What is the Endocrine System? The glands and organs that secrete chemicals (hormones) into the circulatory system for delivery via the blood and lymph to affect the function of other organs, tissues and cells involved in a variety of functions such as: Growth, Reproduction, Development, Digestion/ Metabolism, Appetite control, Metabolic rate (O2 consumption), Osmoregulation, Immunity, Melanin production, Mood, Fight or flight response, Pain perception, Circadian rhythm , Dreams(?) Slide: 3 What is the Endocrine System? Both the nervous and endocrine systems are involved in internal communication but their form and function differ significantly Nervous System Electrical signals Carried by neurons btwn specific locations Fast response Short-term response Endocrine System Chemical signals Carried by blood vessels Slower response Long-term response Slide: 5 The Endocrine system uses hormones to communicate between body parts Gland An organ that synthesizes and secretes a substance into the bloodstream or into ducts or cavities inside the body or on its outer surface. Exocrine glands Secrete products into ducts that lead to the external environment Secretions are not used for communication btwn body parts thus are not hormones Are NOT part of the endocrine system Endocrine glands Secrete products directly into the circulatory system without ducts Secretions ARE used for communication btwn body parts thus ARE hormones ARE part of the endocrine system Some organs contain endocrine cells or tissues. http://commonsensehealth.com/uploads/endocrineglands.gif Slide: 6 Endocrine Glands Figure 45.10 (Campbell 8 th ed)
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Slide: 7 Examples of exo crine glands Secrete products into ducts that lead to external environment Sebaceous gland, sweat gland, lingual glands, mammary gland Exocrine glands are NOT part of the endocrine system Slide: 8 Many organs are both endo crine and exo crine glands Stomach Exocrine Secrete into lumen of gastric gland Mucus cells - mucus Parietal cells - H + and Cl - Chief cells - Pepsinogen Endocrine G-cells secrete gastrin into blood Gastrin stimulates HCl production Coffee stimulates gastrin release increasing HCl in stomach http://en.wikibooks.org/wiki/File:Gastric_gland.png Slide: 9 Many organs are both endocrine and exocrine glands Liver Exocrine Secretes bile into lumen of bile duct Endocrine Along with kidney, secretes thrombopoietin into blood Stimulates platelet production in bone marrow (Megakaryocytopoiesis) Angiotensinogen: raises blood pressure insulin-like growth factor 1 (IGF-1)
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