Lecture Oct-27-11 Chapter 18

Lecture Oct-27-11 Chapter 18 - Oct-27-2011 Bio 2870 A...

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Unformatted text preview: Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Bio 2870 A & P 1 Introduction to Anatomy and Physiology Chapter 18 The Endocrine System Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Homeostasis and Intercellular Communication Direct Communication Exchange of ions and molecules between adjacent cells across gap junctions Occurs between two cells of same type Highly specialized and relatively rare Paracrine Communication Uses chemical signals to transfer information from cell to cell within single tissue Most common form of intercellular communication Endocrine Communication Endocrine cells release chemicals ( hormones ) into bloodstream Alters metabolic activities of many tissues and organs simultaneously Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Homeostasis and Intercellular Communication Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Homeostasis and Intercellular Communication Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Homeostasis and Intercellular Communication The Endocrine System Regulates long-term processes Growth Development Reproduction Uses chemical messengers to relay information and instructions between cells Target Cells Are specific cells that possess receptors needed to bind and read hormonal messages Hormones Stimulate synthesis of enzymes or structural proteins Increase or decrease rate of synthesis Turn existing enzyme or membrane channel on or off Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Introduction to the Endocrine System Figure 181 Organs and Tissues of the Endocrine System. Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Introduction to the Endocrine System Figure 181 Organs and Tissues of the Endocrine System. Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Hormones Figure 182 A Structural Classification of Hormones Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System Circulate freely or bound to transport proteins 1) Free Hormones Remain functional for less than 1 hour Diffuse out of bloodstream: bind to receptors on target cells Are broken down and absorbed: by cells of liver or kidney Are broken down by enzymes: in plasma or interstitial fluids 2) Transport Proteins bound hormones Thyroid and Steroid Hormones Remain in circulation much longer Enter bloodstream More than 99% become attached to special transport proteins Bloodstream contains substantial reserve of bound hormones Secretion and Distribution of Hormones Oct-27-2011 Bio 2870 A & P Ch-18 The Endocrine System...
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Lecture Oct-27-11 Chapter 18 - Oct-27-2011 Bio 2870 A...

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